Too many to name individually... I played pretty much everything at that time. Ultima Online, Quake 2, everything on the Build engine (Duke3D, Blood, Shadow Warrior, etc), GoldenEye, Ocarina of Time, System Shock 2, Deus Ex, Half-Life, Metal Gear Solid... Shit, I think most of the franchises that continue to exist today started in that period or have some of the biggest hits from then, like FF7, 8 and 9.