I just stumbled upon this:
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I think you guys will especially like the ingame multiplayer map editing feature.
The guy behind CMPA is behind it which immediately makes it legit. They are running a Kickstarter right now:
https://www.kickstarter.com/projects/191095869/reflex
To round this up, some concept art:
[Blocked Image: http://i.imgur.com/cGtG7ay.jpg]