Bonus points for any non-D&D or D&D derivative systems.
My first RPG was Palladium Fantasy way back when my grognard uncle invited me to his groups table. I still don’t really grok it, but it was pretty formative of my ideas of what an RPG could be. The lack of balance and extreme existential threats as part of ordinary encounters included.
Needless to say, I haven’t found a group for this system in a looong while, eheh.
Warhammer RPG, Earthdawn 3rd ed or Hero System is my owned top games that see too little game time.
Mutant Undergångens Arvtagare is also sorely missed on the table
Played a lot of dark heresy 2 during corona online with friends. It’s a bit complicated with quite a few skills, but really fun. And because our gm was nice, we barely died :D