GZDoom-GPL is a GPL-compliant fork of GZDoom.
- id Software for Doom
- Randi Heit for ZDoom
- Graf Zahl for GZDoom
- LavenderMoon for the GPL relicense codebase
- DUMB License
- foo_DUMB
- General Public License version 2
- Doom
- GZDoom License
- OpenGL renderer
- Lesser General Public License version 2.1
- Timidity
- Paul Hsieh Derivative License
- The hash function in c_dispatch.cpp
- Revised BSD License
- ZDoom
- zlib License
- zlib