Xiani's Freeplay Start mod for Shadow of Chernobyl provides a nice sandbox alternative to the critically acclaimed title. This is a repack i made of which contains a handful of vanilla friendly enhancements and maybe more will be on the way.
This is (yet again) the full version of the repack with the following fixes: Fixed a CTD when talking with certain NPCs Included missing inventory textures for patches More info in the ReadMe