Perhaps Stalker Anomaly is one of the best mods for this game, the Zone, the irradiated, mutant-infested wastelands around Chernobyl, are larger and more detailed than in any mods. Review here: stalker anomaly mod -
https://insider.games/stalker-anomaly-mod-review/ The unique atmosphere of the zone turns each of your quests into incredible adventures and a unique atmosphere in the game.