Fiwix is an operating system kernel based on the UNIX architecture and fully focused on being POSIX compatible.

It is designed and developed mainly as a hobbyist operating system, but it also serves for educational purposes.

It runs on the i386[1] hardware platform and is compatible with a good base of existing GNU applications.

It uses the Fiwix kernel, includes the GNU toolchain (GCC, Binutils, Make), it uses Newlib v4.4.0 as its C standard library, and Ext2 as its primary file system.

This was a necessary step into the whole bootstrapping process[3] to build a complete Linux distribution from scratch,[4] with Fiwix being currently a crucial part[5] of it.