Unreal Tournament (4?) is being developed along with the UE4 engine and will be released for free once it is finished. The game is currently in alpha stage but has been playable for some time to those who want to try it out. Just recently there was a new map released called Outpost23. You can see the map in this video here: https://www.gamingonlinux.com/artic...me-a-long-way-new-beautiful-map-included.5040