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Freedom of knowledge

The Free Software Foundation, founded in 1985, promotes the right to use, study, copy, modify, and redistribute computer programs. The FSF promotes the development of free software - particularly the GNU operating system and its GNU/Linux variants. The FSF helps to spread awareness of the ethical and political issues of software freedom. Any donation amount is greatly appreciated, and all donations are tax-deductible in the USA.
The Foundation for a Free Information Infrastructure is a non-profit association registered in several European countries, which is dedicated to the spread of data processing literacy. FFII supports the development of public information goods based on copyright, free competition, open standards. More than 500 members, 1,200 companies and 75,000 supporters have entrusted the FFII to act as their voice in public policy questions concerning exclusion rights (intellectual property) in data processing.

Freedom of code

Debian GNU/Linux is a free operating system (OS) for your computer. An operating system is the set of basic programs and utilities that make your computer run. Debian uses the Linux kernel (the core of an operating system), but most of the basic OS tools come from the GNU project; hence the name GNU/Linux. Software that is free only in the sense that you don't need to pay to use it is hardly free at all. You may be forbidden to pass it on, and you are almost certainly prevented from improving it. Software licensed at no cost is usually a weapon in a marketing campaign to promote a related product or to drive a smaller competitor out of business. There is no guarantee that it will stay free. Truly free software is always free. Software that is placed in the public domain can be snapped up and put into non-free programs. Any improvements then made are lost to society. To stay free, software must be copyrighted and licensed.
SourceForge.net provides hosting, completely free-of-charge, to more than 65,000 Open Source software development projects. These projects produce high quality software for you to download and use. To support this service offering, we maintain more than 80 dedicated servers, a full-time staff team and utilize a large amount of bandwidth each month. Despite the costs involved, we continue to provide these services without cost to the Open Source community, as we have done since our site was founded in 1999. Your contribution to SourceForge.net will help us to develop and expand our sizable service offering.
The KDE team is working very hard on providing you with the best desktop available for the UNIX operating system. KDE is available for free and will always be available for free, including each and every line of its source code for everyone to modify and distribute. If you enjoy and use KDE please consider supporting the KDE Project financially. KDE is in constant need of funds in order to finance its operations.
Mandrake Linux is a friendly GNU/Linux Operating System which specializes in ease-of-use for both servers and the home/office. It is freely available in many languages throughout the world.

The discussion of GNU/Linux and Linux is covered by the Free Software Foundation and there's an overview on the Mandrake site.