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.

Summary List Game Engines
GoldSource

GoldSource

3 months ago Released Nov 17, 1998 with a 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...

Source

Source

2 weeks ago Released Oct 31, 2004 with a 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...

Source²

Source²

8 months ago TBD with a commercial licence

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

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3
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