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1. Quake-2 Quake-2 Public

   Forked from id-Software/Quake-2

   Quake 2 GPL Source Release

   C

2. GraphicsGems GraphicsGems Public

   Forked from erich666/GraphicsGems

   Code for the "Graphics Gems" book series

   C

3. Quake Quake Public

   Forked from id-Software/Quake

   Quake GPL Source Release

   C

4. MS-DOS MS-DOS Public

   Forked from microsoft/MS-DOS

   The original sources of MS-DOS 1.25, 2.0, and 4.0 for reference purposes

   Assembly

5. shockmac shockmac Public

   Forked from NightDive-Studio/shockmac

   System Shock (PowerMac version / Official GPL Release)

   C

6. wolf3d wolf3d Public

   Forked from id-Software/wolf3d

   The original open source release of Wolfenstein 3D