FreeGameDev

recently stumbled upon this :

Stonesense is an opensource iso/pixelart-viewer for the closed source asci-art roguelike fortress-building game dwarf fortress.
It has some really awesome pixelart.

project page : http://code.google.com/p/stonesense/
license : dual licensed GPL and artistic license, see project page for details.

Never got into dwarf fortress, but it is a pity that the game itself is closed source, even though this viewer is not. But the graphics seem nice... mybe they could be used for a cool nintendo like turn-based rpg/strat. game