Did you know the GNU Operating System is a complete free software system, upward-compatible with Unix? It upholds the four essential freedoms, ensuring users can run, study, share, and modify their software. I'm grateful for this beacon of software freedom. Let's appreciate and support #GNU! https://www.gnu.org/ #FreeSoftware #SoftwareFreedom
The GNU Operating System and the Free Software Movement
Since 1983, developing the free Unix style operating system GNU, so that computer users can have the freedom to share and improve the software they use.www.gnu.org