Source
CommercialThe Source engine is a 3D game engine developed by Valve Corporation. Its unique features include a large degree of modularity and flexibility, an artist-driven...
OGS Engine is a GoldSrc game engine reimplementation using only original id Tech 2 (Quake/Quake 2) engine (and its forks) sources with some bits from the id Tech 3 engine and no reverse-engineered code
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