Aliens versus Predator (PC)
The
Gold Edition, released in 2000, added three new Marine weapons (pistol, dual pistols and skeeter launcher), mid-level save game feature, and more multiplayer maps. Also, the in-game FMVs have been re-shot with Rebellion team members as actors. The
Classic 2000 edition, released last year, upgraded the game to run on modern PCs.
Descent Maximum (PlayStation)
The
PlayStation version of Descent II that features 30 new, exclusive levels instead of the original ones from the PC version.
Knights and Merchants (PC)
Knights and Merchants: The Peasants Rebellion (2001) is a rel-release of the original 1998'
Knights and Merchants: The Shattered Kingdom with an additional campaign, a few new unit types and new stand-alone scenarios and maps.
Here are a couple of resources concerning
Wolfenstein 3D ports:
Wolfensteins on Other Platforms
Wolfenstein 3D on SNES
Wolfenstein 3D on Apple IIgs
Wolfenstein 3D on Jaguar
Detailed differences between Wolfenstein 3D and Spear of Destiny episodes, also PC/Mac version comparison
Wolfenstein 3D (Jaguar) Review