Hi! There's a new one, still in alpha, made by Estonian ATCOs called
Flight Level.
It can be found on Steam. Can't post links, not enough posts
Disclaimer: I'm one of the devs. A pilot mate suggested I should share here what we're up to.
It's a radar sim for APP and ACC, but as we devs are all ACC controllers, the APP part is a bit behind, but we are working on it
The pilots are automated and clearances are given by clicking in the aircraft label - we intend FL to be a entry point to radar ATC and think that having to learn the phraseology before being able to play would be detrimental.