Previously called the "QUAKE 3 Engine" and one of the most successful licensed engines in history, id Tech 3 was the engine used to create games such as Quake II Arena, Return to Castle Wolfenstein and Soldier of Fortune II: Double Helix. id Tech 3 introduced shaders, curved surfaces, 32-bit color, special effects, bleeding-edge networking and super-smooth speedy hardware rendering.
Source Code Collection of Five ID Tech 03 Games. Quake III Arena, Star Wars - Jedi Knight II: Jedi Outcast, Star Wars - Jedi Knight III: Jedi Academy, Return to Castle Wolfenstein & Wolfenstein: Enemy Territory
Greetings Kainia, Thank you for uploading the sources of all the games, especially jko and jka, they'll be very useful :D
Your welcome.