Xandros ($$ Commercial $$ Linux OS from wich the EeePC OS was forked)
Debian (Disribution from wich Xandros was forked)
Linux (The monolithic Kernel at the heart of all this effort)
Adobe Reader ($$ Commercial $$ available for Linux, Unix, Windows, Mac, Palm, etc)
OpenOffice.org (office suite vailable for Linux and Windows)
FireFox (web browser available for Linux and Windows)
ThunderBird (email client available for Linux and Windows)
KDE (graphical desktop environment for Linux and Unix)