45. Quantum
This OpenStack incubator project aims to enable network-connectivity-as-a-service for clouds built on the OpenStack platform. Just seven months old, the project already offers an version 1.0 API and a couple of plug-ins. Operating System: Linux
46. UnkleBill
47. Ofuz
This cloud-based invoicing, project management and CRM solution was designed to help freelancers and small businesses manage their client interactions. You can run it on your own server for free or use the SaaS version called Ofuz Online. Operating System: OS Independent
48. ROS
Short for "Robot Operating System," ROS offers a set of open-source libraries for controlling robots. It includes device drivers, libraries, hardware abstraction and other capabilities. Operating System: Linux, OS X
49. CloseTheDoor
This tool allows network and security managers to identify all listening ports for their listening ports for IPv4 and IPv6 networks. It provides information and allows you to shut down remote attacks. Operating System: Windows
50. SEO Panel
Released in 2010, this app describes itself as the "world's first seo control panel for multiple websites." Key features include an automatic directory submission tool, keyword position checker, site auditor, Google and Alexa rank checker and more. Operating System: OS Independent
51. Turmeric
Version 1.0 of this eBay-owned SOA platform was released in May of 2011. It's Java-based, standards-based and offers quality-of-service features, monitoring capabilities, a repository library, a type library, an error library, local binding and more. Operating System: OS Independent
52. Diaspora
Launched as an alternative to Facebook, this open source social network has a long way to go to catch Facebook's user base. It offers greater control over your privacy and content. You can sign up to join a current Diaspora hub or create your own Diaspora server using the information from the site. Operating System: Windows, Linux
53. Storyltr
Storyltr brings together all of your Web 2.0 posts from up to 18 different services, including Twitter, Flickr, StumbleUpon, Tumblr and others. It lets you tell the story of your life in your own way. Operating System: OS Independent
54. BuddyPress
Made by the WordPress team, BuddyPress offers "social networking in a box." Its used by thousands of organizations to create social networks for a variety of different groups. Operating System: OS Independent
55. LiveStreet CMS
Similar to BuddyPress, LiveStreet is a content management system for creating blogs or social networks. It boasts easy installation, extensibility and multilingual functionality. Operating System: Linux
56. Pligg CMS
Pligg describes itself as "social publishing" software; that is, it creates websites that invite users to submit their own content and/or vote on current content. Hosting is available through several third-party partners. Operating System: Windows, Linux
57. OpenTripPlanner
This one-year-old project aims to make it easy for government entities to communicate information about public transit schedules, walking and biking routes and other travel-related information. Portland's TriMet, one of the sponsors of the project, currently has a working demo of the software in action. Operating System: OS Independent
58. Backit Down
This app synchronizes files and folders so that you can backup or copy your drives. It works across networks or with external hard drives or USB drives. Operating System: Windows, Linux
59. Coffee
This helpful app keeps your system "awake" during downloads, file transfers, etc. It's very helpful if you don't want your system going into standby mode while it completes a particular activity. Operating System: Windows
60. HummingBird
Although it's still a pre-alpha release, this app is interesting for its ability to let you view your website visitor statistics in real time. It refreshes 20 times per second, giving you immediate insight into what's happening on your site. Operating System: Linux