Call of Chernobyl is a free-play sandbox mod for S.T.A.L.K.E.R. : Call of Pripyat created by TeamEPIC. It features 32 explorable maps, reworked level design and level fixes, new original level, Trucks Cemetery, Full AI and A-Life overhaul, engine and script enhancements, Repeatable task system which bases itself on A-Life events, Customizable weather environments for every map as well as surges and psi-storms from AF3, Character creation which includes name, portrait and faction selection.
Several optional modes such as Ironman mode, story mode and zombie survival mode, new achievements, rankings and reputation system, PDA leaderboard and enhanced PDA statistics, Companion system with keyboard issued commands, many optional side-features and community-made addonMo
Mod won mod of the year ModDB competition, and i was 100% sure that Enderal will win: http://www.moddb.com/newsletter/449
Of course i'm glad this mod won. True Stalker here :)
I have played it a little bit, and it's phenomenal.