So today I was looking for a free Tiled map importer for Unity, and found x-uniTMX: https://bitbucket.org/Chaoseiro/x-unitmx/overview

Only problem: It generates 3d box colliders instead of 2d ones. Saaadd face.

But you can solve it by tweaking a few lines in map.cs. I even did it for you because I love you.

https://github.com/evilseanbot/X-uniTMX2D