Master Arena, made by Powered Games Entertainment is a FPS available on Steam and is completely free to play 😀
For what I understand about the game is that it as been in dev since years, using UDK, made by a bunch of individuals who are working full time job, hence why it took so long to compete and as released the completed game yesterday.
It look like a very good FPS. Movement are not as fluid and as quick as UT4, more like UT2004. Therefore, I must say that it seem very fun to play and as the equivalence of UT in term of weapons, environments, game modes and many more aspects. There is also an editor that can be started from Steam for interested content creator 🙂
They also have a Discord channel. The devs are working hard and answer as quick as they possibly can, so if you want to share your opinion, plz, stay polite and respectful 😉