The best open source alternative to Xonotic is Red Eclipse. If that doesn't suit you, our users have ranked more than 25 alternatives to Xonotic and 15 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Xonotic are AssaultCube, Cube 2: Sauerbraten, Warsow and Nexuiz Classic.
Red Eclipse is a fun-filled new take on the first person arena shooter, built as a total conversion of Cube Engine 2, which lends itself toward a balanced gameplay, with a general theme of agility in a variety of environments.
AssaultCube is a free, multiplayer, first-person shooter game, based on the CUBE engine.
Taking place in realistic environments, with fast, arcade gameplay, it's addictive and fun!
Cube 2: Sauerbraten is a free multiplayer/singleplayer first person shooter, built as a major redesign of the Cube FPS.
Warsow is a completely free fast-paced first-person shooter (FPS) for Windows, Linux and Mac OS X, set in a futuristic cartoonish world where rocketlauncher-wielding pigs and lasergun-carrying cyberpunks roam the streets.
Nexuiz was originally developed by Lee Vermeulen and Forest ‘LordHavoc’ Hale, who started Alientrap in the summer of 2002. The goal of the project was to create a high quality first person shooter that could be played freely across all platforms in one package: PC, Mac, and...
OpenArena is a community-produced deathmatch FPS based on GPL idTech3 technology. There are many game types supported including Free For All, Capture The Flag, Domination, Overload, Harvester, and more. There are 17 unique player models to choose from and 12 weapons.
Quetoo is a Free, standalone first person shooter video game based on id Tech2. Our goal is to bring the fun of oldschool deathmatch to a more contemporary platform, and perhaps to a new generation of gamers.
Fortress Forever is a free game inspired by the earlier versions of the Team Fortress series (Team Fortress Classic and QuakeWorld Team Fortress).
Tremulous is a free, open source game that blends a team based FPS with elements of an RTS. Players can choose from 2 unique races, aliens and humans. Players on both teams are able to build working structures in-game like an RTS.
Zandronum is a multiplayer oriented port, based off Skulltag, for Doom and Doom II by id Software.
a first-person shooter game focused on instagib deathmatch and capture-the-flag gameplay as well as cooperative in-game map editing.
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I like both. Red Eclipse offers acrobatic, parkour-like gameplay options.