StormFox is a free environment mod that will freshen your GMod experience with weather, light, effects and textures.
You can find it on Steam Workshop here.
You can also install from this repository via this link here.
This project is licensed under the Apache License 2.0.
You can find commen and useful functions here.
Please report any bugs via the issue tracker.
Changelogs can be found on the Steam Workshop Page here.