Warfork (a FOSS game)

Warfork is a demanding fast paced first person shooter with a focus on speed, aim, movement, and above all competitive play.

This game works on Linux too. Here is Steam page: https://store.steampowered.com/app/671610/Warfork/ . And here is official Warfork page: https://warfork.com/

There are videos of game play on youtube too, and guides on how to move fast in this game.

Edit: Warfork is a fork of Warsow. https://warsow.net/ .