@fischju
Yeah that looks pretty nice. graphics look shiney.
@Kisama
I believe you are right about castle of the winds, and it doesn't mention source code on site, but I contacted the writer to check.
Its a shame. NWN is a classic.
One of the closest things would be nethack. There is a nice linux graphical frontend called Falcons Eye, theres a newer fork called Vultures eye. Source code is availible, but sadly my 'skills' with computers don't extend to coding/porting.
Another option would...