OpenArena is described as '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' and is a first-person shooter in the games category. There are more than 25 games similar to OpenArena for a variety of platforms, including Windows, Linux, Mac, Steam and Flathub apps. The best OpenArena alternative is Xonotic, which is both free and Open Source. Other OpenArena like games are Unreal Tournament, Quake, AssaultCube and Red Eclipse.
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~.
Serious Sam is a first-person shooter video game series that follows the adventures of protagonist Sam "Serious" Stone and his fight against the forces of the notorious extraterrestrial overlord Mental who seeks to destroy humanity.
Croatia
EU
Urban Terror started as a realism based "total conversion" mod for Quake III Arena. Nowadays, Urban Terror is played using the free, stand-alone, ioquake3 engine modified, which doesn't require Quake III Arena, in addition to being an add-on to id Software's...
United States
Zandronum is a multiplayer oriented port, based off Skulltag, for Doom and Doom II by id Software.
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...
Canada
Fortress Forever is a free game inspired by the earlier versions of the Team Fortress series (Team Fortress Classic and QuakeWorld Team Fortress).
Free online shooter featuring multiple game modes, customizable weapons, numerous maps, both PvP and PvE gameplay, clan wars, and regular updates. Offers character personalization, dynamic events, leaderboards, and fast-paced, tactical multiplayer combat.
South Korea
TrueCombat: Elite is a FREE modification for the Enemy Territory game (also free). It is a realistic modern day FPS featuring state of the art models and textures.
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.
United States
Battle through an onslaught of mystical backwater cultists, possessed militants & even darker forces as you attempt to discover just what lurks beneath the Earth in this retro FPS inspired by the '90s legends.
United States
WoP is the domain of ENTE's comic strip super-hero bad-boy Padman and his motley crew, and their mission is to make your game with some seriously addictive fun, whatever your skill level and whatever character role you jump into.
