Yo, those who haven't heard and love UT and or arena shooters. Epic has released the new UT in alpha so it can be created with the community. If you wanna try it out, or make maps and stuff. (Comes with free optional UDK4) Go here
https://www.unrealengine.com/blog/welcome-to-unreal-engine-4 and click the Get Unreal button in the top right.