+* [MIT Student Information Processing Board](http://sipb.mit.edu/)
+* [Tinc VPN](http://tinc-vpn.org/)
+* [The XCB library](http://xcb.freedesktop.org/)
+* [The Philolexian Society of Columbia University](http://www.columbia.edu/cu/philo/)
+* [Fachschaft Informatik HU Berlin](http://fachschaft.informatik.hu-berlin.de/)
+* [Wetknee Books](http://www.wetknee.com/)
+* [IPOL Image Processing On Line](http://www.ipol.im)
+* [Debian Costa Rica](http://cr.debian.net/)