Action
The action game is a video game genre that emphasizes physical challenges, including hand–eye coordination and reaction-time. The genre includes diverse subgenres such as fighting games, shooter games, and platform games, which are widely considered the most important action games, though some real-time strategy games are also considered to be action games. Read the full article at the Wikipedia.
Killing Floor - Toy Master
by David Hensley and Alex Quick
(16 Oct 2014)
In a free, add-on mod for Killing Floor, created by David Hensley (with help from Killing Floor originator, Alex Quick), you can fight...
Genre: Shooter, Action 
Double Action: Boogaloo
(23 Oct 2014)Double Action is a free stylish multiplayer game about diving, flipping, and sliding your way into action movie mayhem.
Genre: Shooter, Adventure, Action 
Gear Up
(28 Jan 2015)Feel the adrenaline as you control your unique tank in multiplayer arcade action! Build your ultimate war machine from over a million...
Genre: Shooter, Strategy, Adventure, Simulation, Action 
Codename CURE
(17 Jul 2015)Codename CURE is a first person, co-operative zombie game with support for up to five players, providing dynamic, fast-paced zombie...
Genre: Shooter, Adventure, Action 
Fishing Planet
(11 Aug 2015)Fishing Planet is a FREE to play unique and highly realistic online first-person multiplayer fishing simulator developed for anglers...
Genre: Sports, Adventure, Simulation, Action 
Golden Rush
(23 Sep 2015)Golden Rush is a rather unusual fantasy MOBA for four teams.
Genre: Strategy, Action 
Air Brawl
by Landfall
(2 Jun 2015)
A fast paced multiplayer dogfighting game that focuses on creative weapons and game mechanics that reward skillful flying.
Genre: Action 
ONRAID
(1 Mar 2017)Onraid is a challenging 2D shooter game, where you are free to develop your own play style and tactics to destroy your enemies.
Genre: Strategy, Action 
Chaotic Rage
by Josh
1.15
(18 Jan 2017)
Chaotic Rage is an open source zombie shooter game focused on gameplay.
Genre: Shooter, Action 
Pirates, Vikings, and Knights II
(12 Feb 2010)Pirates, Vikings, and Knights II pits three teams against each other in a struggle for wealth, power and total domination.
Genre: Shooter, Action 
Star Fighter
Endless 2d Star Fighter
How Much Can You Score?
Attention linux users this game is now only available for windows
Features:
Battle...
Genre: Arcade, Shoot 'Em Up, Shooter, Action