55. KOffice Replaces: Microsoft Office
KDE's office productivity suite includes word processing (KWord), spreadsheet (KSpread), presentation (KPresenter) database (Kexi), vector drawing (Karbon), project planning (KPlato), diagramming (Kivio) and painting (Krita) software. The user interfaces are quite a bit different than Microsoft products, but some people say the software's content-oriented approach is actually easier to use once you get used to it. Operating System: Windows, Linux.
Replaces: Windows
Known for being user-friendly, Ubuntu has become one of the most popular distributions of Linux, and it comes with thousands of free, open source apps included. It's available in desktop, server and netbook editions.
Ubuntu is based on Debian, so the two distributions are somewhat similar. It's easy to use, secure and includes 29,000 free applications. 58. Fedora Replaces: Windows
The community version of the Red Hat Linux distribution, Fedora is fast, stable, powerful and used by millions of users. The Web site boasts that Fedora is "on the leading edge of Linux and open source software," and it has a reputation for being the first Linux distribution to add new features.
59. openSUSE Replaces: Windows
This is the community version of Novell's SUSE Linux distribution. If you're technically minded, you can follow the instructions to download and install it yourself, or you can purchase a boxed version of the operating system that comes with an installation DVD, a manual and 90 days of installation support.
Replaces: Epicor Retail Store, Retail STAR, POSitouch
Openbravo's POS solution integrates with its ERP software and supports a wide range of touchscreen hardware and barcode scanners. It offers master data management; sales, refund and cash management; warehouse management; charts and reports; integrated security; and an optional restaurant module. Operating System: Windows, Linux, OS X.
61. Lemon POS Replaces: QuickBooks Point of Sale, AccuPOS
Designed specifically for micro, small and medium-sized businesses, Lemon POS offers a simple interface and strong security. It supports many barcode scanners and printers, and it provides inventory control and reporting capabilities as well. Operating System: Linux.
62. Floreant POS Replaces: QuickBooks Point of Sale, AccuPOS
For restaurants only, Floreant offers features like carry out, tax, discounts, food grouping, drawer pull, kitchen ticket, ESC/POS receipt, combined payment system and sales reports. Its users include the Denny's chain. Operating System: OS Independent.
Replaces: Microsoft Project, Oracle Primavera
Used in more than 142 countries and downloaded more than 1.25 million times, OpenProj actively markets itself as an alternative to Microsoft Project, and it opens both Project and Primavera files. It's also available on an SaaS basis through Projects On Demand. Operating System: Windows, Linux, OS X.
64. GanttProject Replaces: Microsoft Project, Oracle Primavera
GanttProject also imports and exports from Project formats and offers a similar set of features. It can create Gantt charts and PERT charts, assign resources and more. Operating System: Windows, Linux, OS X.
Replaces: Windows Small Business Server
Formerly known as E-Box Platform, Zentyal includes gateway, infrastructure management, unified threat management, office server, unified communication server capabilities, FTP and Web server capabilities. Support, security updates, disaster recovery and other services are available on a commercial basis. Operating System: Linux
66. ClearOS
Replaces: Windows Small Business Server
Designed for small organizations, ClearOS combines open source networking, a security gateway, Web server, file server, groupware and more in a single package. You can download the software for free or you can purchase support, services or pre-configured hardware from ClearCenter. Operating System: Linux.
Replaces: Replicon, Tenrox Timesheet
An alternative to punch cards and spreadsheets, TimeTrex assists with scheduling, attendance, job costing and payroll. It's also available in an SaaS version starting at $1.75 per employee per month. Operating System: Windows, Linux, OS X.
68. eHour
Replaces: Replicon, Tenrox Timesheet
Best for consultants, freelancers, lawyers and other firms that charge by the hour, eHou tracks work on a per-project basis. It has an intuitive Web-based interface, is very flexible and offers a number of built-in reports. Operating System: Windows, Linux, OS X.
Replaces: Adobe Dreamweaver, Microsoft Expression Web
Even if you've never typed a single HTML tag in your life, NVU can walk you through the process of creating your own Web site. The software is free and hosting starts at $4.99 per month. Operating System: Windows, Linux, OS X. 70. Kompozer
Replaces: Adobe Dreamweaver, Microsoft Expression Web
Based on much of the same code as NVU, Kompozer offers an easy-to-use WYSIWYG editor and a Web file management system. The interface is similar to that of Dreamweaver, and it offers tabs so that you can easily edit several documents at once. Operating System: Windows, Linux, OS X.
70. Kompozer
Replaces: Adobe Dreamweaver, Microsoft Expression Web
Based on much of the same code as NVU, Kompozer offers an easy-to-use WYSIWYG editor and a Web file management system. The interface is similar to that of Dreamweaver, and it offers tabs so that you can easily edit several documents at once. Operating System: Windows, Linux, OS X.