Organizations

The Apache Software Foundation
Supports the development of a number of open-source software projects, including the apache webserver. Includes license information, latest news, and project sites.
http://www.apache.org/

Free Software Foundation and GNU Project
Non-profit organization dedicated to eliminating restrictions on copying, redistributing, understanding, and modifying computer programs. GNU Project was begun to develop a complete free Unix-like operating system.
http://www.gnu.org/

Free Software Foundation Europe
European branch of the FSF. Includes news and events listings, press information, and a document archive.
http://www.fsfeurope.org/

Jabber Software Foundation
Not-for-profit organization that oversees the general development of XMPP and maintains the Jabber Enhancement Proposals.
http://www.jabber.org/

The Linux Foundation
A non-profit consortium dedicated to fostering the growth of Linux, and promoting standardization and technical collaboration. Provides details of activities and working groups, a collaboration forum, and developer services.
http://www.linuxfoundation.org

Open Invention Network
An intellectual property company that was formed to promote Linux. It acquires patents and makes them available royalty-free to any company, institution or individual that agrees not to assert its patents against the Linux System.
http://www.openinventionnetwork.com/

Open Solutions Alliance
A nonprofit, vendor-neutral consortium dedicated to driving the adoption of comprehensive open source business solutions.
http://www.opensolutionsalliance.org/

Open Source Academy
UK government portal which aims to encourage the use of Open Source Software by local authoritie. Offers opportunities for knowledge sharing and practical advice.
http://www.opensourceacademy.gov.uk/

Open Source Advisory Service
Promotes awareness and understanding of the legal, social, technical and economic issues that arise when educational institutions engage with free and open source software. News, publications, events, and FAQ.
http://www.oss-watch.ac.uk/

Open Source Initiative
Dedicated to managing and promoting the Open Source trademark for the good of the community. Includes a definition of 'Open Source', and a list of approved licenses.
http://www.opensource.org/

Open Source Resource Center
Project of the Pakistan Software Export Board. Includes news, details of strategy, aims and services, discussion forums, and events listings.
http://osrc.org.pk/

Open TTT
A European Union funded project that aims to facilitate transnational technology transfers and open source partnerships for enterprises and network of developers.
http://www.openttt.eu/

OpenForum Europe
Not-for-profit organisation helping to accelerate, broaden and strengthen the use of OSS in business and government. News and events, information about OSS, and articles.
http://www.openforumeurope.org/

Python Software Foundation
Non-profit organization devoted to advancing open source technology related to the Python programming language. Provides membership information, missions statement, and details of how to get involved.
http://www.python.org/psf/

Software in the Public Interest, Inc.
Aims to help organizations develop and distribute open hardware and software. Includes news, details of supported projects, and membership details.
http://www.spi-inc.org/

Xiph.org Foundation
Non-profit corporation dedicated to protecting multimedia from control by private interests, by developing free and open protocols and software. Information about the foundation and its current projects.
http://www.xiph.org/

XMPP Standards Foundation
Contact info, architectural docs and a weblog on Extensible Messaging and Presence Protocol (XMPP), an open XML communications technology.
http://www.xmpp.org/