OpenMW

OpenMW is a free and open-source game engine recreation that reimplements the one powering Bethesda Softworks' 2002 open-world role-playing game The Elder Scrolls III: Morrowind. The project addresses issues with the original Gamebryo engine and provides cross-platform support, improved performance, and enhanced modding capabilities while maintaining full compatibility with the original game's content and most third-party modifications.

The engine is programmed in C++ using modern open-source libraries and requires the original game assets to function, though it does not include copyrighted material from Bethesda. The project has expanded beyond its original scope, with development underway to support other Bethesda titles built on Gamebryo-based engines, including The Elder Scrolls IV: Oblivion, The Elder Scrolls V: Skyrim, and multiple Fallout titles.