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Teeworlds is a free online multiplayer game, available for all major operating systems. Battle with up to 16 players in a variety of game modes, including Team Deathmatch and Capture The Flag. You can even design your own maps!

OpenLieroX - extremely addictive realtime worms shoot-em-up backed by an active gamers community. Play the most famous Liero clone! Windows, Linux and Mac OS X version available.

Cortex Command is a 2-dimensional side-scrolling action game developed by Data Realms. In the game, the player takes the role of a disembodied brain, who controls various clones and robots to achieve his aims. The main goal of the game is mining gold, which is used to purchase new clones, weaponry and craft which is then used to eliminate competitors. As the brain is weak, the player must manage his resources carefully, protecting the brain, mining gold and fighting off enemies. The game includes the ability for players to create mods (additions and changes to the game) with the built in Lua programming applet, and simple scripting. »

Kill Fun Yeah is an online 2D platform shooter. Besides killing your enemies it also involves shooting up and reconstructing your enviroment. You can try out the game for free and if you like it you can upgrade your account to get access to all new content that is being added for a reduced price during the Alpha phase.

Battle other 2D stickman online while jumping around like a lunatic and getting blown up into smithereens. With 70 weapons, Boring Man is the most chaotic and hilarious 2D online shooter on the internet. Customize game modes with highly flexible options and crazy mutators!

Abuse is a dark 2D side-scrolling platform game developed by Crack dot Com in 1995. It features beautiful lighting, realistic animation and nasty alien-like creatures to destroy.

Armajet is an accessible, free-to-play multiplayer shooter designed for mobile that pits teams of players against each other in fast-paced jetpack combat. Players compete in a modern arena shooter that’s easy to learn and hard to master.