by Ter13
Fast, simple, abstract 47-state autojoining library
A few months ago, I launched a code patch to AutotileLib that made it non-functional. Nobody brought this to my attention despite the fact that a number of people knew about it.

Seriously folks. There's a bug reports forum. Use it.

1.0c is out, and fixes a number of problems, as well as adds some requested functionality.

EDIT: 1.0d has also added the ability to automatically swap a turf's icon from a prototype variable called autotile_icon in turf/New(). This will allow you to better differentiate autotiles in the map editor because reasons.