Garrys Mod Wiki
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These are all of the games that support Garry's Mod
Title HL2 Mod or Full Game Free or Paid
Age of Chivalry Mod Free
Alien Swarm Full Game Free
Blade Symphony Full Game Free
Counter-Strike: Global Offensive Full Game Free
Counter-Strike: Source Full Game Paid
D.I.P.R.I.P Mod Free
Day of Defeat: Source Full Game Paid
Dino D-Day Full Game Paid
Dystopia Mod Free
Fistful of Frags Full Game Free
G String Game Full Game Paid
Half-Life 2 Full Game Paid[Notes 1]
Half-Life 2: Deathmatch Full Game Paid
Half-Life 2: Episode 1 Full Game Paid
Half-Life 2: Episode 2 Full Game Paid
Half-Life 2: Lost Coast Full Game Paid
Half-Life Deathmatch: Source Full Game Paid
Half-Life: Source Full Game Paid
INFRA Full Game Paid
INSURGENCY: Modern Infantry Combat Mod Free
Left 4 Dead Full Game Paid
Left 4 Dead 2 Full Game Paid
Nuclear Dawn Full Game Paid
Pirates, Vikings, and Knights II Full Game Free
Portal Full Game Paid
Portal 2 Full Game Paid
Team Fortress 2 Full Game Free
The Stanley Parable Full Game Paid
Zeno Clash (Model Pack)

Found in your library games dropdown under "Tools"

Full Game Paid
Zombie Panic! Source Full Game Free
  1. Garry's Mod includes all non-map and VCD data from Half-Life 2 and Half-Life 2: Lost Coast as part of its version of the Source 2013 SDK; mounting is only required for maps, cutscene data, or any content introduced in the Half-Life 2 Episodes.
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