The best open source alternative to Cataclysm: Dark Days Ahead is Shattered Pixel Dungeon. If that doesn't suit you, our users have ranked more than 25 alternatives to Cataclysm: Dark Days Ahead and 13 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Cataclysm: Dark Days Ahead are Pixel Dungeon, NetHack, Dungeon Crawl Stone Soup and Brogue.
Shattered Pixel Dungeon is a Roguelike RPG, with pixel art graphics and lots of variety and replayability. Every game is unique, with four different playable characters, randomized levels and enemies, and over 150 items to collect and use.
Pixel Dungeon is a traditional roguelike game with pixel-art graphics and simple interface. Explore the depths of Pixel Dungeon, collect useful items, fight fierce monsters to find Amulet of Yendor (surprise!) - the ultimate artifact of this game world.
NetHack is a single player dungeon exploration game that runs on a wide variety of computer systems, with a variety of graphical and text interfaces all using the same game engine. Unlike many other Dungeons & Dragons-inspired games, the emphasis in NetHack is on discovering...
Dungeon Crawl Stone Soup is an open-source, single-player, role-playing roguelike game of exploration and treasure-hunting in dungeons filled with dangerous and unfriendly monsters in a quest to rescue the mystifyingly fabulous Orb of Zot.
Descend into the depths of the dungeon until you reach the foul daemon known as "He who the author cannot spell consistently", or, Baezl'bub. When you have slain Baezl'bub in heroic combat, or, if Baezl'bub dies in any way, retrieve his black heart and...
Egoboo is an open source, cross-platform computer game. It's a three-dimensional dungeon crawling adventure that borrows a lot of elements from the roguelike genre. Egoboo is still under development, but it is fully playable.
Tales of Maj'Eyal (ToME) is an open-source, single-player, tactical role-playing roguelike and action game set in the world of Eyal.
LambdaHack : a small dungeon crawler illustrating the roguelike game engine of the same name
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