Favorite mods for games?

Hello. So basically I'm a diehard Windows gamer and I usually play the same games.
After all, I have more than 500 hours on Hotline Miami 2 as I'm writing this.

And I have this amount of hours because of, well, modding and stuff.
Wanna ask ye to share your fav mods so maybe I can try them. I'll start.

Hunter Saga (HLM2)
A Real Human Bean Saga (HLM2)
Mace's levels (HLM2)
Zombie Goose's levels (HLM2)
Summer of Rage level collection (HLM2)
Program (HLM2; also contributed to it lmao)
Time Tripper (DOOM II)
Open Fortress (Source '13)
Rise Of The East (RA2: Yuri's Revenge)
Twisted Insurrection (C&C: Tiberian Sun)
Dawn of the Tiberium Age (C&C: Tiberian Sun)