Source code is available for this game.
Angband
Multi-platform Computer Games 1990@608
BSD Trek
Unix 1976@839
Brogue
Windows 2010@2064
DoomRL
Windows 2013@594
Dungeon Crawl Stone Soup
Multi-platform Computer Games 2006@864
Infra Arcana
Windows 2010@615
Nethack
Multi-platform Computer Games 1987@629
Rogue
Multi-platform Computer Games 1980@593
Star Trek
SDS SIgma 1971@827
Tales of Maj'Eyal
Windows 2012@1332