* [NetBSD wiki](http://wiki.netbsd.org)
* The [GNU Hurd](http://www.gnu.org/software/hurd/)
* [DragonFly BSD](http://www.dragonflybsd.org/)
+* [X.org](http://www.x.org/)
+* [Freedesktop.org](http://www.freedesktop.org/) and many projects therein
* [Monotone](http://wiki.monotone.ca/)
* The [Free Software Foundation](http://fsf.org) uses it for their internal wiki, with subversion.
* The [cairo graphics library](http://cairographics.org/) website.