id Software
Quake, Quake II, Quake III Arena, Doom and Doom 3 are trademarks of id Software LLC, a ZeniMax Media company. Game content © id Software.
Source code under the GNU General Public License. The demos are under their own licences: Quake II, Quake III Arena and Doom 3.
Crack dot Com
Abuse is a trademark of Crack dot Com. Its source code and shareware data are public domain.
Sound effects © Bobby Prince, used with his permission (details). GeneralUser GS soundfont by S. Christian Collins (licence).
Farbrausch
fr-041: debris. and fr-030: Candytron are by Farbrausch. Source code under the BSD licence; data and music under Creative Commons Attribution 3.0.
Gelasio and Arimo fonts under the SIL Open Font License (Gelasio, Arimo).
Future Crew
Second Reality is by Future Crew, with music by Purple Motion and Skaven. Source code and data under the Unlicense.
IBM VGA font from VileR's Ultimate Oldschool PC Font Pack (CC BY-SA 4.0).
Netplay Tech is not affiliated with or endorsed by id Software, ZeniMax Media, Crack dot Com, Farbrausch or Future Crew.