Richard Stallman announced in September 1983 the plan to develop a free software Unix-like operating system called GNU. GNU is the only operating system developed specifically for the sake of users' freedom.
What is GNU?
GNU is a Unix-like operating system that is free software—it respects your freedom. You can install versions of GNU (more precisely, GNU/Linux systems) which are entirely free software. What we provide.
The GNU Project was launched in 1984 to develop the GNU system. 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.
A Unix-like operating system is a software collection of applications, libraries, and developer tools, plus a program to allocate resources and talk to the hardware, known as a kernel.
The Hurd, GNU's own kernel, is some way from being ready for daily use. Thus, GNU is typically used today 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.
Planet GNU 
March 2014 GNU Toolchain update: Hi Guys, It has been a fairly quite month in GNU toolchain land this month. The GCC mainline is getting very close to being ready to branch for the 4.9 release... more
2014-03-16-gsoc: The Google Summer of Code 2014 is on! If you're a student, consider applying for a GNU Hurd project -- details to be found on our GSoC and project ideas pages.
Release 1.1.4 is imminent - Please test: Spillover Appending over-length notes spill into next bar. Works for rests too. Optional – set a preference for old behavior. Shortcuts Cheat Sheet Cur... more
For more news, see Planet GNU and the list of recent GNU releases.
Spell
Spell is a command-line spell-checking program. It reads through a text input and prints each misspelled word on a line of its own. It is implemented as a wrapper for GNU aspell or ispell. (doc)
What is Free 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”.
Free software is a matter of the users' freedom to run, copy, distribute, study, change and improve the software. More precisely, it refers to four kinds of freedom, for the users of the software:
- The freedom to run the program, 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.
Take Action
- Support current FSF campaigns.
- Defend privacy, and support global copyright reform with LQDN.
- Support the efforts on net neutrality in Europe, in the USA and in Canada.
- Fight against software patents: worldwide, and Europe.
- Watch and share this movie: Patent Absurdity—made possible by FSF associate members like you.
- Call on WIPO to change its name and mission.
- Students! Claim a refund on your unused Microsoft Windows licences.
- Add to the Free Software Directory.
- More action items.
Can you contribute to any of these High Priority Projects? Gnash, coreboot, free distributions of GNU/Linux, GNU Octave, drivers for network routers, reversible debugging in GDB, automatic transcription, PowerVR drivers, and also free software replacements for Skype, OpenDWG libraries, and Oracle Forms.
Can you take over an unmaintained GNU package? gleem, gnatsweb, gnukart, groff, halifax, indent, jwhois, metahtml, orgadoc, polyxmass, superopt, teximpatient, are all looking for maintainers. Also, these packages are looking for co-maintainers: aspell, gnuae, metaexchange, powerguru. See the package web pages for more information.