The stand-alone mod S.T.A.L.K.E.R. Anomaly aims to be the most stable and customizable experience for fans of the S.T.A.L.K.E.R. games. It's powered by the Monolith 64-bit engine, a custom fork of the X-Ray engine.
Part 2/3 of S.T.A.L.K.E.R. Anomaly 1.5.0 - for links to the other 2 parts, read the detailed description. It does NOT require any previous versions of S.T.A.L.K.E.R. Anomaly.