Help find the mod (STALKER: Shadow of Chernobyl)

Hello, once playing Stalker: Shadows of Chernobyl for a long time, and there I had the opportunity to modify weapons and armor. And behind the railway, on an abandoned farm, there was a stalker base. The plot of the game is the same as in the original.

But I understand that these were mods.

Please help me find them !!!

At least a mod that allows you to modify weapons and armor, but does not change the plot of the game.

Zarya, thank you so much !!!!