Valve opens up Direct3D to OpenGL's translation layer, allowing developers to migrate games to Linux:
Https://github.com/ValveSoftware/ToGL
Valve Steambox Host System Steamos is based on Debian Linux and can be downloaded and installed for free:
Http://store.steampowered.com/steamos/buildyourown
Steam for Linux Games list:
http://store.steampowered.com/browse/linux/
Ubuntu can install steam playing games like Dota2 and Left4Dead2:
http://store.steampowered.com/about/
Ubuntu 14.04 (i5-3230m integrated graphics HD4000) in Firefox 37 full frame (60FPS) running WebGL fps game bananabread:
Http://static.oschina.net/uploads/space/2015/0905/142046_aVTz_561214.png
Ubuntu running Flash Stage3D game:
http://my.oschina.net/eechen/blog/365324
Http://www.oschina.net/news/76139/6-game-linux
Valve opens the Direct3D to OpenGL translation layer, allowing developers to migrate games to Linux (six best Linux distributions for gamers)