GNU

GNU
Development and releases Current developer Community
Specifications Written in Various (notably C and assembly language) OS family Unix-like Kernel type Microkernel (GNU Hurd) or Monolithic kernel (GNU Linux-libre, fork of Linux) Default user interface GNOME
Availability and legalities Source availability Free Software Licensing GNU GPL and variants
Other Official website https://gnu.org/

GNU is a free and open-source operating system that is developed by the GNU Project. GNU is a recursive acronym for "GNU's Not Unix!"