There were so many good ones:-
7th Guest (1993)
Age of Empires 1 & 2 (1997 & 1999)
Baldur's Gate (1998)
Cannon Fodder (1993)
Commandos: Behind Enemy Lines (1998)
Command & Conquer (1995)
Command & Conquer: Tiberian Sun (1999)
Cyber Empires (1992) (aka "Steel Empire")
Diablo (1996)
Doom 1, 2 & Final Doom (1993, 1994, 1996)
Dune (1992)
Half Life (1998)
Heretic (1994)
Hexen (1995)
Jagged Alliance 2 (1999)
Lemmings (1991)
Lemmings 2: The Tribes (1993)
Quake 1-3 (1996, 1997, 1999)
System Shock 1 & 2 (1994 & 1999)
Theme Hospital (1997)
Theme Park (1994)
Thief (1998)
Tom Clancy's Rainbow Six (1998)
Unreal Tournament (1999)
Worms Armageddon (1999), etc.
+ Pretty much every old LucasArts, Sierra, etc, adventure game
listed on ScummVM (Day of the Tentacle, Sam & Max Hit The Road, Monkey Island, Space Quest, Beneath A Steel Sky, Broken Sword, etc).
And if you include the year 2000 : Baldur's Gate 2, Deus Ex, Diablo 2, Giants: Citizen Kabuto, No-One Lives Forever, Thief 2, etc.
And like many other people, before the PC's came Commodore 64 / ZX Spectrum, etc, (Boulder Dash, Double Dragon, Gauntlet, Ghostbusters, etc). Happy days. If I could go back in time and swap that lot for a PS4, I don't think I would. Learned so much more growing up with a computer than a console (learning BASIC to start with).