I've spent a lot of time creating levels in my game and i've noticed
that building levels in an organic way requires a lot of repeated
actions that could easily be replaced by a custom tool.. so i made one!
Here is a video that sums up the main features:
It's mainly aimed at assets that aren't strictly tile-based; it works
well with workflows that have a modular, kitbash type of approach.
Asset store: https://www.assetstore.unity3d.com/en/#!/content/93315
Also, feel free to send me feature suggestions to the email address provided on the asset store page.