Checking the evidence…Reading the prices…Writing the verdict…
Developers
GSC Game World
2 games in the catalogue.
S.T.A.L.K.E.R. 2: Heart of ChornobylWorth considering$41.99−30% · was
$59.9930% off, but it has been cheaper
81% positive on Steam
S.T.A.L.K.E.R.: Shadow of ChernobylBuy on sale$19.99
Regular price; it has been much cheaper
94% positive on Steam
Best verdict first. The developer name is taken from the Steam page, so a studio that publishes under two names may appear twice.