Nazi Zombies: Portable by NZ:P Team and contributors.
https://github.com/nzp-team/nzportable
Code: GPLv2 or later. Assets: CC BY-SA 4.0, with exceptions below.

Browser Games Now, 2026-10-18: rebuilt pinned FTE engine and QuakeC;
Solo-only menu, removed social badges and web counter; native PK3 volumes.
Excluded all 6 Sky_Waldon01 JPGs and their README because it restricts
commercial use. Replaced with original procedural dusk skies, dedicated to
the public domain under CC0. Four maps retain their geometry/gameplay.
Remaining included asset bytes are unchanged.
No commercial Quake or Call of Duty game files required.

Nazi Zombies: Portable uses and remixes assets from several external artists. This file's intent is to attribute these artists. They are listed in no particular order.

- Zander Noriega ("Dragged Through Hellfire Abomination"): CC-BY 3.0
- Pro Sensory ("Halloween"): CC0
- tricksntraps ("Ascend", "Flying Temple", "Glory Days", "Starting Over"): CC0
- Hansjörg Malthaner [http://opengameart.org/users/varkalandar] ("Glass Bell Sounds"): CC-BY-SA 3.0

If you believe your work is used by Nazi Zombies: Portable and is missing from this list, please open an issue so you can be credited:
https://github.com/nzp-team/nzportable/issues