I'll start:
Spoiler:
- Half-life 1
- Counter-Strike 1.6
- Broforce
- The Expendabros
- Shadow Warrior Classic
- Pretty much all Id Tech 1/Doom Engine IWADs (Ultimate/BFG Doom, (BFG) Doom II, TNT, Plutonia, Heretic, Hexen: Shadow of the Serpent Riders, Hexen: Deathkings of the Dark Citadel, Strife: Quest for the Sigil, Chex Quest 3, Harmony, Action Doom 2: Urban Brawl)
- Doom 3
- Doom 3 BFG Edition
- Command and Conquer: Red Alert 2 + Yuri's Revenge
- Dominion: Storm Over Gift 3
- Ultima 4 - Quest of the Avatar
- Teenagent
- Sam and Max - Hit The Road
- Beneath a Steel Sky
- Age Of Empires I + Rise Of Rome
- Starcraft 1 + Broodwar
- System Shock
- UFO: Enemy Unknown/X-COM: UFO Defense
- Duke Nukem 3D: Plutonium Pack
- Dragonsphere
- Fallout
- GTA: San Andreas
- GTA: Vice City (Which I can't play because it's [censored word] and says I have no audio hardware)
- Marathon
- McPixel
- Metal Gear Solid (Which I also can't play because the screen gets cut off and no windowed mode)
- Minecraft
- Quake
- Quake II
- Quake III Arena
- Warcraft III + Frozen Throne