xrick port on MacOSX
A version compiled for MacOS X of this nice game is available here: http://membres.lycos.fr/mavati/xrick/
Go play it!
This game is so cool. I loved it on the ST and I like this Linux port as well. Take it as a precursor to Lara Croft. It is almost the same gameplay without 3d graphics :)
If you only need one reason to play this game, the Waaaa of Death should be enough.
An open, cross-platform journaling program.
A scientific plotting package.