Valve
18 games developed, 21 published.
Developed
best rated first
92 Portal 2
85 Left 4 Dead
83 Artifact
81 Counter-Strike: Global Offensive
80 Team Fortress 2
80 Portal
80 Half-Life
79 Half-Life 2
71 Day of Defeat
70 Counter-Strike
66 Counter-Strike: Condition Zero
64 Dota Underlords
31 Counter-Strike Nexon
75 Half-Life 2: Deathmatch
73 Deathmatch Classic
Half-Life: Game of the Year Edition
79 Half-Life: Uplink
Half-Life 2: Episode Three
Published
best rated first
92 Portal 2
89 Left 4 Dead 2
85 Left 4 Dead
83 Artifact
81 Counter-Strike: Global Offensive
80 Team Fortress 2
80 Portal
80 Half-Life
79 Half-Life 2
71 Day of Defeat
70 Counter-Strike
66 Counter-Strike: Condition Zero
64 Dota Underlords
89 Half-Life 2: Episode Two
88 Half-Life 2: Episode One
79 Garry's Mod
75 Half-Life 2: Deathmatch
70 Codename: Gordon
Counter-Strike Neo
73 Deathmatch Classic
Half-Life 2: Episode Three