OpenXRay/xray-15
X-Ray Engine 1.5 expansion. Original version was used in S.T.A.L.K.E.R.: Clear Sky.
GitHub repository with 181 stars and 65 forks.
Language: C++
Topics: directx9, directx10, opengl, game-engine, stalker, gsc-game-world, xray-engine, x86, x64, improved