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This client-server based software makes it easy to give each student a different version of a test because it can pull questions from a pre-established database. It's available in nine different languages. Operating System: Windows, Linux, OS X.
This computer-based assessment software aims to simplify the creation, delivery and scoring of tests. It's available under an open source license for non-commercial use or with a paid commercial license. Operating System: OS Independent
This project aims at helping medical providers "better document, understand, plan, and manage their patients' health and health care delivery." It's been translated into multiple languages, and the website includes success stories from practitioners who have used it in several different countries. Operating System: Windows, Linux, OS X
This Web-based EHR and practice management solution boasts a modern, intuitive interface. See it in action with the online demo. Operating System: Windows, Linux, OS X
An official GNU project, this award-winning application combines EMR functionality with a hospital information system and a health information system. It was designed to comply with industry standards, and it's been adopted by the United Nations University. Operating System: Windows, Linux, OS X
Also known as "Mountain Meadow Medical Records," M is an EMR program that a practice in Virginia has been using for a decade. It offers an intuitive interface and fast performance. Operating System: Windows, Linux, OS X
Built on the Tolven Platform, Neuron is an EHR system created by software company Roberts-Hoffman. It was designed to adapt to provider workflows, communicate with other systems and use the latest technologies. Operating System: OS Independent.
Certified by the Office of the National Coordinator of Health Information Technology, OpenEMR boasts that it is "one of the most popular open source electronic medical records in use today." Commercial support is available through third-party partners. Operating System: Windows, Linux
OpenMRS began as a project to fix the medical record system at a clinic in Kenya and has grown into a leading open source medical record system used around the world, particularly in developing countries. It describes itself as "both just a library of API calls and a database and a default implementation of those API calls in the form of a web application." Operating System: Windows, Linux, OS X
Owned by Medsphere, Open Vista is the open source version of the Veterans Administration's VISTA EHR system. Because the technology has already been used extensively at more than 1500 VA facilities, it's one of the more mature and usable open source EHR's, and users say it compares very favorably with proprietary solutions. Operating System: Windows, Linux
Like OpenVista, WorldVista is also based on the VISTA EHR software developed for the Veterans Administration. It's ONC-ATCB certified, and it adds several modules not included in VISTA, such as pediatrics and obstetrics. Operating System: Windows, Linux
Short for "Zambia Electronic Perinatal Record System," this unique EHR was specifically designed to improve obstetrics care in Africa. It's now been in use in clinics throughout Zambia for five years. Operating System: Linux
Best for preschoolers and toddlers, ChildsPlay is a set of memory matching, letter recognition and simple math games. It also includes a few less-educational activities like puzzles, pong, pacman and billiards. Operating System: Windows, Linux, OS X.
With more than 100 activities, GCompris is huge collection of educational games for children. It can help users learn to read, to tell time, to understand the water cycle, to draw cartoons, to identify different country maps, to play chess and much more. Operating System: Windows, Linux.
KLettres teaches the very youngest computer users to recognize the appearance and sound of letters and syllables. It's also useful for older computer users who are learning a new language, such as Arabic, Czech, Brazilian Portuguese, Danish, Dutch, British English, English, English Phonix, French, German, Hebrew, Hungarian, Italian, Kannada, Hebrew, Hindi Romanized, Low Saxon, Luganda, Malayalam, Norwegian Bokmål, Punjabi, Spanish, Slovak, Ukrainian or Telugu. (Note that in order to use KLettres on Windows, you'll have to download KDE for Windows.) Operating System: Windows, Linux.
Quick! Solve the math problems before the comet kills the penguin. The user can select the appropriate difficulty, whether that's adding numbers zero through three or multiplying and dividing negative and positive integers. Operating System: Windows, Linux, OS X.
An educational option for pre-schoolers, Tux Paint is a simplified drawing program that is extremely easy to use. It includes fun sound effects, a stamping tool, a cartoon mascot and other features designed to appeal to youngters. Operating System: Windows, Linux, OS X.
Known as "the Outlook of Linux," Evolution offers a very familiar interface for joint email, calendar and address book. It's popular among Linux users and integrates with many other open source applications. Operating System: Linux. EDITOR'S PICK.
Made by Mozilla (the organization behind the Firefox browser), Thunderbird is an email client with an easy-to-use interface with advanced search, security and customization capabilities. A separate project called Lightning adds calendar functionality to make it more like other groupware applications. Operating System: Windows, Linux, OS X. EDITOR'S PICK.
This app describes itself as a way to send "fake" email. You can use it send email that looks like it comes from any email address you like. Operating System: OS Independent
Downloaded more than 450,000 times, OpenEMM claims to be the "first open source application for e-mail marketing." See the link above for the open source version, or visit the Agnitas website for information on commercial support and eMM-Xpress, the cloud-based version of the same software. Operating System: Windows, Linux.
According to its website, phpList is "the world's most popular open source email campaign manager." In addition to the free download, it comes in a hosted version with fees based on the number of messages sent or the number of subscribers. Operating System: OS Independent.
Short for "Android Privacy Guard," APG is an implementation of the OpenGPG encryption standard for Android. It offers encryption, decrption, signing and key management capabilities. Operating System: Android
With more than 3.2 million users, this Windows-only encryption solution is tremendously popular. Features include password protection, integration with Windows Explorer and support for multiple languages. It can encrypt files stored on your hardware or on a cloud service, including Dropbox, Google Drive and Microsoft OneDrive. Operating System: Windows
This replacement for the standard Unix crypt function uses the Rijndael block cipher version of AES to provide strong encryption. Like Crypt (below), it doesn't have a graphic interface and is best used by those comfortable working from the command line. Operating System: Windows, Linux, OS X
At just 44KB, this is one of the fastest, lightest weight encryption tools available. However, because it's a command line tool, it's best for experienced system administrators or advanced users. Operating System: Windows
Also designed to be small and lightweight, Encrypt is a cross-platform tool with strong encryption capabilities. It aims to be fast and easy to use. Operating System: Windows, Linux, OS X, Android
This command-line tool implements the OpenPGP standard to encrypt email communications. It's utilized by a number of other open source encryption tools. Operating System: Linux.
This is the version of GNU Privacy Guard (GPG) for Windows users. It encrypts fils and email, and paid professional support is available. Operating System: Windows
This app ports GPG for Mac users and is based on MacGPG. Several other encryption-related tools are also on the site. Operating System: OS X.
LUKS stands for "Linux Unified Key Setup," and it encrypts an entire drive. It's useful for hard disk backups and other types of storage that need password protection. Operating System: Linux
This replacement for the Unix crypt allows developers to add a wide range of encryption functions to their code, even if they don't know a lot about cryptography. The Web site contains a list of supported algorithms that are included in the Libmcrypt library. Operating System: Windows, Linux, Unix
This file-based encryption program supports AES, DES, Triple-DES, IDEA, RC4, RC5, CAST-128, BlowFish, SkipJack and other algorithms. Like AxCrypt, it integrates into Windows Explorer for ease of use. Operating System: Windows
Still looking for an alternative to Google Reader? If you're tech-savvy enough to deploy it on your own server, Stringer might be for you. It's a "self-hosted, anti-social RSS reader" with no social or sharing capabilities but plenty of keyboard shortcuts. Operating System: OS Independent
Explorer++ extends the capabilities of the standard Windows Explorer with tabbed browsing, an improved interface, keyboard shortcuts, file merge, file split, and customization capabilities. Like the regular Windows Explorer, it also offers drag-and-drop functionality. Operating System: Windows
The KDE file manager, Krusader is a twin-panel commander-style file manager. It boasts extensive support for archived files, advanced search, batch re-naming, file content comparisons and more. Operating System: Linux
Java-based muCommander supports local volumes plus FTP, SFTP, SMB, NFS, HTTP, Amazon S3, Hadoop HDFS and Bonjour. It makes it easy to quickly move and rename files and also includes compression capabilities. Operating System: Windows, Linux, OS X.
Nautilus, the file manager for the Gnome desktop, is available for most Linux distributions. The intuitive interface should feel familiar to anyone who's ever used a file manager. Operating System: Linux
Similar to Explorer++, this very popular open source project extends the functionality of Windows Explorer with tabs and other interface improvements. Support for Windows 8 is planned. Operating System: Windows.
Designed for security and privacy, ANts P2P encrypts everything you send or receive over the network and masks connections so that users are untraceable. It's Java-based, so it will run on most platforms. Operating System: OS Independent.
Very recently updated, Ares is a BitTorrent client and chat program that allows users to share images, audio, video, software and documents. It includes a built-in player and a library organizer. Operating System: Windows.
This Windows client for the Direct Connect/Advanced Direct Connect file-sharing network has been downloaded millions of times. The site includes a helpful tutorial and beginner's guide for those who aren't sure how P2P works. Operating System: Windows.
eMule claims to be one of the most popular peer-to-peer file-sharing clients available. It can download torrents and offers fast performance and search. Operating System: Windows, OS X.
FrostWire is a combination BitTorrent client, YouTube downloader and media player. It also supports Android devices, so you can take your media files with you on the go. Operating System: Windows, Linux, OS X, Android.
With most file sharing apps, you open up your files to the entire Internet, but with RetroShare, you share files and communicate only with trusted friends. It lets you set up your own secure file-sharing network and offers features like encrypted and communications and strong authentication. Operating System: Windows, Linux, Unix, BSD
This Windows peer-to-peer client offers support for multiple networks including EDonkey2000, Gnutella, BitTorrent and Gnutella2. Key features include global searching, multiple results tabs, previews, user comments, ratings, skinnable interface, sophisticated file-hashing and block lists to enhance security. Operating System: Windows.
If you combined Dropbox and Bittorrent, the result would be something like Sharefest. It allows you to share files with anyone without storing them in the cloud. The link above takes you to the actual service, but you can find the source code on GitHub. Operating System: OS Independent
One of the most popular BitTorrent clients, Vuze makes it easy for novices to get started downloading hi-def video while offering plenty of features for advanced users. Operating System: Windows, Linux/Unix, OS X
A good option for UNIX administrators, Connectbot is a SecureShell (SSH) client that allows users to manage simultaneous SSH sessions, create secure tunnels, and copy/paste between other applications. If you search for the app on Google Play, you'll also find a fork that updates some of its capabilities. Operating System: Android
This Firefox add-on has been downloaded more than 33 million times. It allows you to download files via FTP or SFTP right from your browser window. Operating System: Windows, Linux, OS X
Award-winning WinSCP can transfer files securely via SFTP, SCP or FTPS (and it also includes an FTP client for transferring files without security). It includes two different interface choices. Operating System: Windows.
This app boasts that it can help students learn just about any type of information, whether they are learning a new language, studying for medical exams or trying to remember guitar chords. It comes in iOS and Android versions, making it ideal for learning on the go. Operating System: Windows, Linux, OS X, iOS, Android.
If you need to memorize something—anything—Genius can help. It's a spaced repetition flashcard program that can help you pass a test, master a subject, prepare for a speech and more. Operating System: OS X
Very similar to FlashQard, Java-based jVLT also uses the Leitner method to help students master concepts. However, this app focuses primarily on vocabulary, making it ideal for students who are studying a foreign language. Operating System: Windows, Linux, OS X
One of the better flashcard apps available, Mnemosyne was born from a research project that is studying the nature of long-term memory. It supports multiple card formats and uses an algorithm to determine which card should appear next. Users who choose to do so can upload their progress anonymously in order to provide data for the research team. Operating System: Windows, Linux, OS X, Android/
In addition to traditional flashcards, Parley also utilizes anagrams, multiple choice, fill-in-the-blank, synonym/antonym and other types of tests to improve your vocabulary. Many user-created card sets are available at KDE for Windows. Operating System: Windows, Linux
Java-based Pauker lets you take your flashcards with you on almost any device. Like many of the other apps in this category, it uses the Leitner method of flashcard presentation to strengthen your ultra-short-term, short-term, and long-term memory. Operating System: OS Independent
Step Into Chinese isn't as complete as the Rosetta Stone option, but it does offer a dictionary and other tutoring aids. It includes more than 26,000 words and 8,300 characters. Operating System: Windows, Linux, OS X
Designed to be useful for advanced students and beginners alike, Zkanji is a Japanese dictionary and flash card system. It also includes an animated kanji stroke order tool for learning to write the characters. Operating System: Windows
ZWDisplay is especially good at teaching users to read and understand Chinese text. It uses a system based on the book Chinese Through Tone & Color by Nathan Dummitt. Operating System: Linux
The Open Digital Evidence Search and Seizure Architecture, aka "ODESSA," offers several different tools that for examining and making reports on digital evidence. This is an older project, but still valuable. Operating System: Windows, Linux, OS X
If you need to examine a drive in detail, The Sleuth Kit is a set of command-line tools for digital analysis, and Autopsy Browser provides a graphical interface for using those tools. The same team is also working on Sleuth Kit Hadoop Framework, a cloud-based tool for analyzing many drives very quickly. Operating System: Windows, Linux, OS X.
This historical real-time strategy game allows players to lead their own ancient civilization. It's won several awards, boasts realistic historical details and includes a map editor. Operating System: Linux, Windows, OS X.
This simple puzzle game is surprisingly addictive. Move numbers around the grid until the numbers combine to hit 2048. Run out of moves and your turn is over. Operating System: Online, iOS, Android.
Built "in the tradition of the Battle Isle series," ASC is a turn-based strategy game with 2D graphics and an overhead view of the action. You can expand the basic game with one (or more) of the many user-created maps available on the website. Operating System: Windows, Linux.
According to its website, this sci-fi-based shooter "features immersive arenas, freaky and violent weapons, and a vibrant community." It's tremendously popular with plenty of game servers, fan sites and tournaments available online. Operating System: Linux, Windows, OS X.
This PC and Android game features "roller coasters from hell that we travel at full speed in a barrage of explosions." There are 25 main levels, plus boss fights, and you can earn access to 18 more levels by getting a high score. Operating System: Windows, Linux, Android.
An "old school arcade game slung into the 21st century," Armagatron Advanced is a 3D take on the Tron light cycle game from the 80s. Up to sixteen people can play at once, against each other and/or the AI. Operating System: Windows, Linux, OS X, Android.
AssaultCube offers extremely realistic settings but is lightweight and low latency, making it a good option for players with underpowered systems or poor connection speeds. It includes twelve different multiplayer modes and 26 different maps, plus a map editor so you can create your own. Operating System: Linux, Windows, OS X.
This fork of the popular first-person shooter integrates some of the best features of Battlefield, Quake and Call of Duty into AssaultCube, while maintaining a lightweight footprint. Other improvements include ricochet shots, new weapons, improved radar and more. Operating System: Windows, Linux
Those who enjoy high fantasy will like this turn-based tactical strategy game that features elves, dwarves, orc, mermen and many other races. Play against up to eight other players in multiplayer mode. Operating System: Linux, Windows, OS X, iOS.
Designed to help pool players practice when a real table isn't available, Billiards has a very lifelike physics simulator. It includes both pool and billiards tables and can play eightball, nineball and carom. Operating System: Linux.
Customize your starship and battle against enemies in this "fast-paced team-based outer-space multi-player arcade game." Several online servers are available. Operating System: Windows, Linux, OS X, Android.
Many real-time strategy games are set in the past, but Bos Wars is set in the future. Both single- and multi-player games are available. Operating System: Windows, Linux, BSD, OS X.
Research suggests that dual n-back activities can improve working memory and fluid intelligence, and they also seem to help some ADHD/ADD sufferers. Downloaded more than 384,000 times, Brain Workshop lets you give your brain a workout by trying dual n-back exercises for yourself. Operating System: Windows, Linux, OS X
Short for "Battle Zone Capture the Flag," BZFlag is a 3D multiplayer online tank game with retro graphics. It gets hundreds of downloads every week, and there's a tremendous amount of help on the website for new players. Operating System: Windows, Linux, OS X.
A rogue-like adventure game, Cataclysm is set in the first days after an apocalypse. Players must find food, shelter, water and defense while battling zombies and other horrors. Operating System: Windows, Linux, OS X.
This self-described "silly zombie shooter game," features tanks, boats, helicopters, trains and, of course, zombies. You can view the action from the top down, in first-person or in third person, and you can play alone or with friends. Operating System: Windows, Linux, OS X, Android.
This vertically scrolling shooter game invites you to pilot the cargo spaceship Chromium BSU through a maze of enemy fighters, attempting to destroy them before they destroy you. It's fast-paced and hard enough that most games don't last longer than fifteen minutes. (Note that this game doesn't have anything to do with Google's Chromium project.) Operating System: Windows, Linux.
Downloaded millions of times, the classic version of Nexuiz has been beloved by many generations of gamers. Note that this is the older open source version, but there is also a newer paid version. Operating System: Windows, Linux, OS X.
Suitable for ages 9 and up, Code Combat is a multi-player game that teaches players how to code. You can play online through the website or download it from GitHub. It offers more than 110 free levels, and tutorials and other levels are available with a subscription. Operating System: OS Independent
Forked from Boswars, this real-time strategy game is set in Stalinist Russia. Build up your economy and army quickly so that you're ready for the eventual Nazi attack. Operating System: Windows, Linux.
This old-school dungeon crawler invites players to explore a fantasy world, battle monsters, master magic and uncover treasure. The graphics are extremely simplistic, but the world is large with 3,000 different maps, 150 monsters, 13 races and 15 different types of characters to play. Operating System: Windows, Linux, OS X.
Build elevated trains on a city grid with this puzzle game. A paid expansion pack ads 11 more levels. Operating System: Windows, Linux, OS X.
Domination is a modified version of the board game Risk for PCs and mobile devices. Several different maps are available, and it has a multi-player option. The mobile versions are available through Google Play or the Amazon Appstore. Operating System: Windows, Linux, OS X, Android, Blackberry.
This game describes itself as "A roguelike adventure through dungeons filled with dangerous monsters in a quest to find the mystifyingly fabulous Orb of Zot." You can download the game and play alone or access one of the many online game servers. Operating System: Windows, Linux, OS X, Android.
This 3D dungeon-crawler challenges players to save Lord Bishop from the clutches of the evil Dracolich, slaying hordes of monsters along the way. Play with up to four other people as you make your way through 40 different dungeons. Operating System: Windows, Linux, OS X
The latest version of this classic puzzle game, released last December, adds 51 new levels to the thousands already available. It's extremely popular and highly praised for its addictive gameplay. Operating System: Windows, Linux, OS X.
Epic Inventor is a side-scrolling role-playing game with multiple levels. It has been compared to Minecraft, except that the emphasis is on crafting items instead of on building. Operating System: Windows, Linux.
This epic adventure puts you in the shoes of a futuristic space traveler suddenly transported to King Arthur's court in Camelot. It includes 42 solo-play levels and 27 multiplayer levels. Operating System: Windows, Linux, OS X.
This updated version of the classic Linux game Tux Racer features Tux the Linux penguin sliding down a mountain on his belly just like the original. Race your friends to see who can achieve the fastest time. Operating System: Windows, Linux, OS X.
More than a decade old, this puzzle game challenges players to help two fish escape from increasingly difficult levels. It's a remake of an older ALTAR interactive game. Operating System: Windows, Linux, OS X.
In this action-adventure game, players must battle against multiple enemies as they make their way through various landscapes. They interact with other players, collect items in the inventory and master various skills. Operating System: Windows, Linux, OS X.
This top-notch flight simulator is so realistic it can be used to help with pilot training, industrial engineering or research. The basic software is free, but you can purchase additional aircraft and scenery (as well as mugs and T-shirts) from the website. Operating System: Windows, Linux, OS X, others.
In this turn-based strategy game, play starts in America in 1942, and you win if you eventually declare independence from Britain and survive the Revolution. It's very similar to the games Colonization and Civilization. Operating System: Windows, Linux, OS X.
Inspired by the game Civilization, FreeCiv is a turn-based multi-player strategy game where players must guide their tribes from the stone age to the space age. It's a mature game with plenty of online help available for new players. Operating System: Windows, Linux, OS X.
Freedoom is based on the Doom engine, but adds free content. It offers plenty of action, and it is compatible with mods created for the original Doom. Operating System: Windows, Linux, OS X, Android.
If you're feeling nervous about Microsoft's purchase of Minecraft, check out Freeminer. Very similar to Minecraft, this game features a nearly infinite world where players can dig and build whatever they can imagine. Operating System: Windows, Linux, OS X.
Built in "the tradition of the Master of Orion games," FreeOrion is an empire-building strategy game set in the reaches of space. Play against the AI or against other humans in multiplayer mode. Operating System: Windows, Linux, OS X.
You can think of Frets on Fire as an open source version of Guitar Hero that you can play with a guitar controller or your keyboard. It can play Guitar Hero songs or the many songs created by the community, or you can create your own songs with the built-in editor. Operating System: Windows, Linux, OS X.
This classic Linux game has spawned an entire genre of similar games. This version offers more than 100 levels, multiplayer support and a level editor. Operating System: Windows, Linux.
Gang Garrison 2 is a 2D "demake" of Team Fortress 2. It has received rave reviews and has been downloaded more than 130,000 times. Operating System: Windows.
For players of all ages, GBrainy offers logic puzzles, mental calculation, memory trainers and verbal analogy games. It's goal is to help users stay sharp mentally. Operating System: Windows, Linux.
In this real-time strategy game, the armies of Tech and Magic war against each other. It has won several awards and inspired many other games, including MegaGlest (see below). Operating System: Windows, Linux.
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