Wow, Dwarf Fortress. In case anyone doesn't know, it's supported exclusively by donations and the developer apparently refuses to do it any other way. It's really incredible, because (especially during updates) he makes upwards of $15k/month off donations. Evidently, that's enough, so he keeps chugging along....
It supports sprites and I also wouldn't play without them - try, for example, the 'lazy newb pack'[1] which includes the popular sprite packs in the installer. There seems to be a newer kit [2] but I haven't tried that.
