http://www.linuxcnc.org/

http://www.tech-edv.co.at/lunix/CADlinks.html

http://www.linuxledgers.com/

http://www.linuxcanada.com/

http://thancad.sourceforge.net/

http://www.linuxpcrobot.org/

http://linuxastronomy.org

http://sites.google.com/site/laranjeirasdevel/Home

http://www.perl.org/

 http://forum.ubuntu.ro/index.php