Bit hard to narrow it down… what do you enjoy? And have you played much from that era?
Just off the top of my head… simcity 2000, Ultima 4,5,6,7, the quest for glory series, civilization 1 and 2, fallout 1 and 2, xcom, master of orion… there are a ton of classics that are still worth playing.
For something perhaps a little less popular, maybe try Tex Murphy?
Edit: oh, I just remembered Commandos! if you’re a masochist, anyway. That game is hard as balls. Fun, though.