Alligatorcon: I'd still love to see the Battletech, MechWarrior and MechCommander games. Sadly, they're plagued with both legal and technical issues.
Apparently, the MechWarrior 2 engine runs on black magic, judging from its track record in regards to compatibility.
I'd kill to see GOG get Mechwarrior 2 and the expansions to run on Windows 10. I've still got the disks, but no luck getting it to run. Even with the incredibly dated graphics, I'd still go for it. Soundtrack alone makes it worthwhile.
tysonius: Mindcraft games
HeresMyAccount: There's a pretty new game on here that looks very similar to Minecraft, but I don't remember what it's called. Check the constructive games.
No, I really meant "Mindcraft" with a "d." It's a company that went away back in the 90s, I think. Pretty small, but had some fun titles. Most web searches turn up "minecraft" of course, so you really have to know what you're looking for to find relevant information.
Plus, I've still got Minecraft--what game could top that for world-building? :D