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ioquake3 is a free software (GPLv2+) first person shooter engine.
You can use it to play Quake 3: Arena and the mods people have made for it.
Make your own game from the source code.
Or play a game that someone else has made.
Improvements
| Technical Features | ||||
| ioquake3 | idtech3 | 3D Construction Kit | Z-Machine | |
| 3D rendering | ✓ | ✓ | ✓ | X |
| OpenGL2+ rendering | ✓ | X | X | X |
| Texturemapped surfaces | ✓ | ✓ | X | X |
| Networked Multiplayer | ✓ | ✓ | X | X |
| Fun to play in 2014 | ✓ | X | X | ✓ |
| Ogg Vorbis support | ✓ | X | X | X |
| VOIP | ✓ | X | X | X |
| IPV6 support | ✓ | X | X | X |
| SDL backend | ✓ | X | X | X |
| 3D glasses support | ✓ | X | X | X |
| 64-Bit support | ✓ | X | X | X |
| MinGW support | ✓ | X | X | X |
| Console command history | ✓ | X | X | X |
| Color POSIX term output | ✓ | X | X | X |
| GUID System | ✓ | X | X | X |
| Multiuser support(Win) | ✓ | X | X | X |
| PNG texture support | ✓ | X | X | X |
| Skeletal Models (IQM) | ✓ | X | X | X |
| Fast In-Game Downloads | ✓ | X | X | X |
| Surround Sound on all platforms | ✓ | X | X | X |
| Supported Platforms | ||||
| Windows | ✓ | ✓ | X | X |
| Mac OSX | ✓ | X | X | X |
| Linux | ✓ | ✓ | X | X |
| Open-Source-ness | ||||
| GPL | ✓ | ✓ | X | X |