Sigerous (SGM) comes from a Russian development team that's headed up by Nikolay Bolotov (GeJorge), It was in development for many years and in that time a number of excellent versions were released. The plan is to upload a selection of All-in-ones that span from SGM 1.7 up to SGM 2.2. Note: I'm not one of the mod's developers, my involvement has been through doing the English translations from 1.7 Geonezis on. Each mod will come with a read me that gives you any relevant info you'll need and a list of known contributors.
There's 4 copies of Stalker on Steam up for grabs, 1x SOC, 2x CS and 1x COP.
Over the next week There will be screenshots with questions put up (Not always Stalker related), The first to get the question right gets to choose a game. There global codes so there's no regional limit to worry about. The screenshots could turn up here or on any of the following pages.
Swamps bridge
Stalker Clear Sky