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Find extensions for your Joomla site in the Joomla Extensions Directory, the official directory for Joomla components, modules and plugins.

Zotero is a powerful, easy-to-use research tool that helps you gather, organize, and analyze sources and then share the results of your research.

Debian GNU/Linux is a free distribution of the GNU/Linux operating system. It is maintained and updated through the work of many users who volunteer their time and effort.

LinkedIn strengthens and extends your existing network of trusted contacts. LinkedIn is a networking tool that helps you discover inside connections to recommended job candidates, industry experts and business partners.

CoActivate offers free tools to help you build an online community and promote real-world change

Tiki Wiki CMS Groupware -- A full-featured, open source, multilingual, all-in-one Wiki+CMS+Groupware written in PHP.

AbeBooks is your source for Used, New, Rare and Out of print books. Find classic collectibles, rare signed editions, used textbooks, and inexpensive bestsellers from independent booksellers worldwide.

Software Freedom Day - The worldwide celebration of Free Software!

From AboutUs: See what information we have on Wiki and share your knowledge.