[Requires Unity 2D Extras (which is free)]

https://github.com/Unity-Technologies/2d-extras
Confirmed to work with 2D extras V1.5.0-preview and Unity 2019.3.0f3. Newer versions may not work!

If you work with 2D tilesets, you probably know how time-consuming it is to create variations of tiles that work with every single combination of neighboring tiles.

Also,have you ever tried using Unity's rule tile system but gave up trying to figure out the rules for each combination?

TileGen was made to solve those exact problems. First, it generates a complex tileset containing variations for every single combination of neighboring tiles, using only the basic corner/inverse corner/edge and middle tiles as reference.

Then it automatically creates a Rule Tile asset for you, using the complex tilemap it just generated. All of that with a single click!