Definitely Gamma World for me, even though it's the one game that has been perpetually updated over the years. I still enjoy breaking out and running the version based on 4e mechanics and the version based on 2e still has a prized place on my shelf (the version based on Alternity wasn't as much fun IMO).
From there probably Star Frontiers would be my next ask, but it would be a monkey's paw wish because they'd update it with 5e mechanics. I'll just be content with my hardcover reprints I got on DriveThru I think.
If it's a game/setting that I wouldn't mind seeing updated to 5e-style mechanics, probably Dark*Matter. It's an INCREDIBLY 1990s setting so it's possible it wouldn't update well to current day, but I still enjoy it.
From there probably Star Frontiers would be my next ask, but it would be a monkey's paw wish because they'd update it with 5e mechanics. I'll just be content with my hardcover reprints I got on DriveThru I think.
If it's a game/setting that I wouldn't mind seeing updated to 5e-style mechanics, probably Dark*Matter. It's an INCREDIBLY 1990s setting so it's possible it wouldn't update well to current day, but I still enjoy it.