OpenRA – Tiberian Dawn

An alliance of nations fights to protect Europe and northern Africa from a mysterious terrorist organization and the valuable but toxic alien mineral, Tiberium, that is slowly spreading over the world.
The Tiberian Dawn mod focuses on fast and fluid play, taking heavy influences from modern RTS games.
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You can download the game client from the project webpage or install it directly from your distribution repository through package manager.
Centos/Fedora/Korora users will install via openSUSE repository.

Red Eclipse: A free arena shooter

Fun for everyone, young and old, noob or expert. Available for Windows, GNU/Linux, BSD, and macOS. Parkour, impulse boosts, dashing, and other tricks. A huge amount of mutators and game altering variables. Create maps with other players in realtime co-op edit. Over ten years of active development, and still going!
Red Eclipse is a fun-filled new take on the first person arena shooter, featuring parkour, impulse boosts, and more.
The development is geared toward balanced gameplay, with a general theme of agility in a variety of environments.
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You can download the game client from the project webpagegithub or install it directly from your  distribution repository through package manager.