Valve the company behind the games such as Half Life and Half Life 2 is located in Bellevue, Washington. They are a exciting and dynamic company well known for picking up mods as retail games and welcoming budding game designers to there head office for tours.

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2
Source

Source

2 Commercial licence

The Source engine is a 3D game engine developed by Valve Corporation. Its unique features include a large degree of modularity and flexibility, an artist-driven...

28
GoldSource

GoldSource

18 Commercial licence

This QuakeWorld-based engine powered some of the most critically acclaimed engine's of it's day, like Half-Life, Counter-Strike, Day of Defeat, and many...

138
Source²

Source²

47 Commercial licence

The announced next gen source engine. Currently in the making for HL³, and Left 4 Dead 3.

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