CS:GO |
Counter Strike: Global Offensive, the premier online FPS [Free-to-Play] |
No |
Warfork |
Fork of Warsaw to continue development, Cel-shaded Quake-like online FPS |
CC-SA |
Cube 2 |
Online Quake-like Arena FPS with multiple game modes & level editor |
zlib |
Assault Cube |
Counterstrike-like FPS in the Cube engine |
Freeware |
Xonotic |
Quake-like arena online FPS |
GPL |
FreeDoom |
Open-source implemantation of Doom, best used with Chocolate Doom |
Yes |
Dystopia |
Cyberpunk online class-based FPS |
??? |
Urban Terror |
Fast paced online FPS reminiscent of CS |
??? |
OpenArena |
Online arena FPS using the id tech engine |
??? |
Fistful of Frags |
Online Western FPS - Not as good as it used to be |
??? |
Ravenfield |
Singleplayer Battlefield type game |
No |
Alien Arena |
Retro Sci-Fi Online FPS |
??? |
Red Eclipse |
Online FPS with parkour |
SRC Available |
ET Legacy |
Wolfenstein: Enemy Territory for modern PCs |
SRC Available |
Team Fortress 2 |
Class-based online FPS with many game-modes to choose from (Not suitable for weak PC) |
No |
Team Fortress 2 Classic |
Sick of hats, nerfs, and other changes to TF2? Than Classic is for you! TF2 Classic is a resurrection of what the game was like in 2013, with restored gamemodes, guns, and classes |
No |
Open Fortress |
A total conversion of TF2 with unique characters, weapons, gamemodes, and maps! |
No |
Aleph One |
Open Source implementation for Bungie's Marathon series |
GPL |
Double Action Boogaloo |
Online 3rd-person shooter with slow motion |
No |
Ultrakill Prelude |
Demo for an ultra violent oldschool FPS |
No |
OpenSpades |
Clone of Ace of Spades 0.75, featuring fully destructible terrain and plenty of game modes |
GPL |
Blade of Agony |
Story-driven FPS inspired by WWII shooters from the 90's and early 2000's - Extremely polished and fun |
SRC Available |
I wrote more about it a while back in this post, if you're curious. But it's more on how I got out of it, and not the specifics of all the crazy shit we believed, which would be lengthy.