OpenEnroth/OpenEnroth

Open-source engine for Heroes of Might and Magic III

OpenMW is an open-source open-world RPG game engine that supports playing Morrowind. Main repo and issue tracker can be found here: https://gitlab.com/OpenMW/openmw/

GemRB is a portable open-source implementation of Bioware’s Infinity Engine.

Exult is a project to recreate Ultima 7 for modern operating systems, using the game's original plot, data, and graphics files.

fheroes2 is a recreation of Heroes of Might and Magic II game engine

Open-source re-implementation of The Elder Scrolls: Arena.

Open source recreation of Daggerfall in the Unity engine

A replacement engine for Ultima VII The Black Gate (and eventually Serpent Isle) that presents a new camera angle and other improvements.

openblack is an open-source game engine that supports playing Black & White (2001).