Rimworld Together (RimWorld multiplayer mod)
Contributed by @Greelan
Link: Save 20% on RimWorld on Steam
A sci-fi colony sim driven by an intelligent AI storyteller. Generates stories by simulating psychology, ecology, gunplay, melee combat, climate, biomes, diplomacy, interpersonal relationships, art, medicine, trade, and more.
Developed as an alternative to Open World, the mod is in active development.