Dwarf fortress modding is very easy to learn

I had a personal adventure mode mod that added a ton of reactions for the player to use: butcher any corpse, leather curing and crafting, bone crafting, weapon sharpening, item decorating. Also changed necromancers to different elemental magic schools, each with their own set of spells to unlock via tome/slab

I had another that removed all the fantasy races and creatures, then split up humans by biome into the standard western fantasy trope races (Northmen, steppe riders, desert people, marsh people etc), each with their own distinct appearances, clothing/armor/weapon styles, cultural preferences, and even custom conlangs based on real world language groups