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GNU is the only operating system developed specifically to give its users freedom. What is GNU, and what freedom is at stake?

What is GNU?

GNU is an operating system that is free software—that is, it respects users' freedom. The GNU operating system consists of GNU packages (programs specifically released by the GNU Project) as well as free software released by third parties. The development of GNU made it possible to use a computer without software that would trample your freedom.

We recommend installable versions of GNU (more precisely, GNU/Linux distributions) which are entirely free software. More about GNU below.

Try GNU/Linux

 [Screenshot of PureOS 8 with GNOME 3 desktop] 

PureOS 8 with GNOME 3 desktop, PureBrowser (web browser), and Gimp (image editor)

 [Screenshot of Trisquel 8 with MATE desktop]   [Screenshot of GuixSD 0.15 with GNOME 3 desktop]   [Screenshot of PureOS 8 with GNOME 3 desktop] 
Trisquel 8 & MATE GuixSD & GNOME 3 PureOS 8 & GNOME 3

... or Try parts of GNU

What is the Free Software Movement?

The free software movement campaigns to win for the users of computing the freedom that comes from free software. Free software puts its users in control of their own computing. Nonfree software puts its users under the power of the software's developer. See the video explanation.

What is Free Software?

Free software means the users have the freedom to run, copy, distribute, study, change and improve the software.

Free software is a matter of liberty, not price. To understand the concept, you should think of “free” as in “free speech”, not as in “free beer”.

More precisely, free software means users of a program have the four essential freedoms:

  • The freedom to run the program as you wish, for any purpose (freedom 0).
  • The freedom to study how the program works, and adapt it to your needs (freedom 1). Access to the source code is a precondition for this.
  • The freedom to redistribute copies so you can help your neighbor (freedom 2).
  • The freedom to improve the program, and release your improvements to the public, so that the whole community benefits (freedom 3). Access to the source code is a precondition for this.

Developments in technology and network use have made these freedoms even more important now than they were in 1983.

Nowadays the free software movement goes far beyond developing the GNU system. See the Free Software Foundation's web site for more about what we do, and a list of ways you can help.

More about GNU

GNU is a Unix-like operating system. That means it is a collection of many programs: applications, libraries, developer tools, even games. The development of GNU, started in January 1984, is known as the GNU Project. Many of the programs in GNU are released under the auspices of the GNU Project; those we call GNU packages.

The name “GNU” is a recursive acronym for “GNU's Not Unix.” “GNU” is pronounced g'noo, as one syllable, like saying “grew” but replacing the r with n.

The program in a Unix-like system that allocates machine resources and talks to the hardware is called the “kernel”. GNU is typically used with a kernel called Linux. This combination is the GNU/Linux operating system. GNU/Linux is used by millions, though many call it “Linux” by mistake.

GNU's own kernel, The Hurd, was started in 1990 (before Linux was started). Volunteers continue developing the Hurd because it is an interesting technical project.

More information

Planet GNU RSS Feed

FSF Licensing and Compliance Lab: 2018 and the future: We are currently running a fundraising drive to launch free software to new frontiers. Would you consider supporting the work of the Fre...

Bootstrapping Rust: Slowly, systems programming languages are getting better in the sense of giving more guarantees and automating what can be automated without downsides.Rust is one of the m...

Back from SeaGL 2018: SeaGL 2018 has concluded. Thank you to everyone in the local Seattle community who came to participate!As previously announced, Chris Marusich gave a talk introducing GN...

For more news, see Planet GNU and the list of recent GNU releases.

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Short descriptions for all GNU packages

Today's random package…

Libmatheval

GNU libmatheval is a library to parse and evaluate symbolic expressions input by the user as text. It can be loaded from both C and Fortran. The interpreter is flexible, supporting any number of variables of arbitrary names, decimal and symbolic constants, basic unary and binary operators, and elementary mathematical functions. It can also compute symbolic derivatives and output expressions to strings. (doc)

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 [FSF logo] “The Free Software Foundation (FSF) is a nonprofit with a worldwide mission to promote computer user freedom. We defend the rights of all software users.”

The Free Software Foundation is the principal organizational sponsor of the GNU Operating System. Support GNU and the FSF by buying manuals and gear, joining the FSF as an associate member, or making a donation.

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