Calico is an open source project that brings the Atari Jaguar version of Doom to PC. Maintained by team-eternity on GitHub, it aims to faithfully recreate the Jaguar port rather than the original PC release, making a historically distinct version of the classic shooter accessible to modern players.
The Jaguar edition of Doom was notable for its differences from the PC original, including unique level layouts and engine quirks specific to Atari's console hardware. Calico lets players experience those differences without tracking down original cartridge hardware.