Some miscellaneous stuff.

Mods that I'm not sure if they even work.

Stuff that alter the Gameplay, some minor while others quite much. About "Replica minigunner from F.E.A.R": It may not change the Damage the Arachnoids deal, nor their Health, but I think it changes their Hitbox so it'd make sense, but then they're harder

New, Custom Campaigns and Levels that change things of the Vanilla Elements, such as replacing Weapons, Enemies, and Sounds, even though I think these changed Elements should've been their own thing. It should be illegal to change something from the Core G

New old Versus Maps.

Stuff that really alters the games as a whole.

Mods that somehow alter the original Files instead of being additions and one of which without being advertised as doing so. It's the case for the Cry of Despair sounds, it shouldn't affect vanilla, but it changed the Kleers' jumping sound. The Crosshairs

Mods that alter specifically the graphics, models, and audio.

Stuff that are added.