The best open source Turn Based alternative to Shattered Pixel Dungeon is Cataclysm: Dark Days Ahead. If that doesn't suit you, our users have ranked more than 25 alternatives to Shattered Pixel Dungeon and four of them are open source Turn Based Games so hopefully you can find a suitable replacement. Other interesting open source Turn Based Game alternatives to Shattered Pixel Dungeon are Dungeon Crawl Stone Soup, Andor's Trail and Tales of Maj'Eyal (ToME).
Cataclysm: Dark Days Ahead is a roguelike set in a post-apocalyptic world. Surviving is difficult: you have been thrown, ill-equipped, into a landscape now riddled with monstrosities of which flesh eating zombies are neither the strangest nor the deadliest.
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.
Andor's Trail is a single-player quest-driven roguelike fantasy dungeon crawler RPG with a powerful story.
Tales of Maj'Eyal (ToME) is an open-source, single-player, tactical role-playing roguelike and action game set in the world of Eyal.
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