Several.
* ReactOS, a project to create a free reimplementation of Windows, is based in Germany.
* KolibriOS and MenuetOS are primarily worked on by Russians. * The Linux kernel was created by Linus Torvalds, from Finland, and many distributions are also created in several countries, including Romania (NimbleX), France (AbulÉdu), Latvia and Lithuania (Baltix), Brazil (Dreamlinux), Spain (gnuLinEx), Germany (LiMux), Norway (Skolelinux), Argentina (Tuquito), and South Africa (Ubuntu).