Much like the original Cube, the aim of this game is fun, old school deathmatch gameplay and also to allow map/geometry editing to be done cooperatively in-game.
The engine supporting the game is entirely original in code & design, and its code is Open Source (ZLIB license, read the docs for more on how you can use the engine).
Authors, feature list and more: see the reference documentation or the wiki.
2020 Edition (December 21, 2020):
Download for Windows - 926 MB
Download for Linux - 940 MB
Download for MacOS - 953 MB
LINKS:
Quadropolis (community site for maps etc.)
SauerDuels (competitive league)
Sauerworld (community blog/news/forum)
sourceforge project page (downloads/subversion)
Wouter's homepage (developer/designer)
Lee's homepage (developer)