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.linux-foundation.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/

Open Source Software Distribution Initiative (OSSDI)
- Distribution of open source alternatives to expensive commercial software packages, especially in education. Site shows current status, and how to help.
- http://www.ossdi.org/

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/

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/

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

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/

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/

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/

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

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/

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/