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- raw (Rewritten engine for Another World) and Another World GBA for Another World (lost, see New RAW)
- REminiscence for Flashback: The Quest for Identity
- ResidualVM for GrimE, the engine used in Grim Fandango and Escape from Monkey Island (ScummVM sister project)
- RTC (Return to Chaos) is a recreation of Dungeon Master, Chaos Strikes Back, and Dungeon Master II, made by George Gilbert.
Read more about this topic: Game Engine Recreation