devtrackers.gg
Wow this is awesome! Looking forward to see what map designs you guys come up with so please keep sharing those in this sub too! ;)
I feel bad for having to say "no" every time someone brings up the map editor topic but: No. We ourselves are using a mix of different tools to design, create and populate our maps (and some of them are licensed software, not tools developed by us) - there isn't that one editor that already exists and can just be made public.
We're aware this is a subject dear to the hearts to several of you, but the efforts to potentially create something like that are unfortunately too high, when we need our resources for other things.