FLOSS Foundations

Linux Foundation, Free Software Foundation, Apache Foundation, Mozilla Foundation and Eclipse Foundation could be categorized as the "Top Foundations" in terms of popularity. Hosting projects as the Linux Kernel, GNU tools, the Apache Web Server, Mozilla Firefox or the Eclipse Editor.

However, there are more Foundations apart from the previous ones. In fact, there is a whole bunch of Foundations, associated to the most successful Open Source projects. A good place to check them is the Foundations directory of http://flossfoundations.org/, where other important foundations can be found. Among Foundations associated to Open Source Projects, it can be found [2]:

- The Blender Foundation
- Django Software Foundation
- FreeBSD Foundation
- Gentoo Foundation
- GNOME Foundation
- KDE e.V.
- NetBSD Foundation
- OpenBSD Foundation
- The Perl Foundation
- PostgreSQL.US
- Python Foundation
- X.org Foundation

Besides this, we find other very important associations, not associated to a particular project, but to accomplish Open Source and Open-knowledge advocating and promotion. Examples of them are [2]:

- Wikimedia Foundation
- OpenSource Initiative
- Free Software Foundation
- Tex Users Group
- Creative Commons
- OpenDoc Society
- Subversion Corporation

Another category of associations are the ones having to do with regional promotion of FLOSS.  Examples of them [2]:

- Associaçao SoftwareLivre.org (Brasil)
- El Centro de Software Libre (Chile)
- Fundación Via Libre (Argentina)
- Free Software and Open Source Foundation for Africa
- Software Libre Argentina
- Software Livre Brasil
- Software Libre Chile

Some other Foundations are dedicated to promotion of open standards across the Web and Internet. The most remarkable examples are  [2]:

- Internet Software Consortium
- XMPP Standards Foundation
- Xiph.org

Last, but not least, other Foundations have to do with heterogeneous activities, such as Open Health promotion, Digital Rights defence,  Public-Domain works promotion, Social Development, etc. Examples of this kind of Foundations are:

- Electronic Frontier Foundation
- Shuttleworth Foundation
- OpenHealth Tools
- OpenHardware Foundation

In the end, a lot of Foundations appearing on the list.
However, which are the most active? Which of them have greater supporters? Who of them have strong companies behind?
A good parameter for evaluation has to do with revenues. No doubt the most successful project, the Linux kernel, has behind the Foundation with the higher revenues. A good article from Brian Proffitt for ITWorld, showed the revenues of the most important Foundations in the USA [3]:

The Linux Foundation: 2010 Exercise:  Revenues: 9,618,043$
Mozilla Foundation: 2010 Exercise: Revenues: 1,934,659$
Free Software Foundation Inc.: 2009/2010 Exercise: Revenues: 889,400$
Python Software Foundation: 2010 Exercise: Revenues: 706,136$
Gnome Foundation Inc.: 2009/2010 Exercise: Revenues: 636,648$
Apache Software Foundation: 2010/2011 Exercise: Revenues: 539,410$

In the end, the Linux Foundation, surely because of the great companies behind it.

To conclude, just highlighting that, although the numbers of Computer, Technology and Internet industry are huge, no significant amount of money is handled by the most important Foundations (Linux Foundation as exception), taking into account the importance of the projects behind them, as well as the important labour they accomplish.

Reference:
[1] http://flossfoundations.org
[2]  http://flossfoundations.org/foundation-directory
[3] http://www.itworld.com/it-managementstrategy/260688/nonprofit-open-source-organizations-booming