Flying Toaster
Explorer
Funny, this is a very D&D thing (theme) to me, but I feel like it's missing from a lot of the "what is OSR" discussions I see.
By the way, I think Zork was free-to-play in Call of Duty: Black Ops. So it's not too dusty.
Some groups in the OSR scene seem to want games to be “serious business!!!”, which does not seem to have been the most prevalent attitude back in the day, at least as far as we can tell now.