Warsow is described as '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' and is a first-person shooter in the games category. There are more than 10 games similar to Warsow for a variety of platforms, including Windows, Linux, Mac, BSD and Flathub apps. The best Warsow alternative is Xonotic, which is both free and Open Source. Other Warsow like games are Unreal Tournament, Quake, Red Eclipse and Serious Sam.
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.
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.
SPRAWL 96 is a celebration of our retro shooter SPRAWL, released for the first anniversary of SPRAWL's release. It’s also our way of giving thanks and giving back to the communities which made SPRAWL possible.
Digital Paint: Paintball 2 is a Paintball game that started out as a mod for quake 2 but then took on a life of its own as an open source fps game with a global player and clan management system.
a first-person shooter game focused on instagib deathmatch and capture-the-flag gameplay as well as cooperative in-game map editing.
A truly free and open source multiplayer shooter, no strings attached. Have casual deathmatch matches on various scenarios. Build your own levels with the ingame editor and assets that come with the game, or just play around and use it as a sandbox.
Freedoom is a WIP a complete free content game based on the Doom engine. It's not an engine, but it's replacement game data with entirely original content, Compatible with a majority of game mods made for Doom. Comes in Three Flavors~.
a quick Quake sourceport hack by Aardappel
This sourceport has one most significant feature: a "panorama" mode, allowing you to see 360 degrees around.
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