External track editors

From Stunts Wiki

Due to the limitations of in-game track editor, some Stunts fans created their own track editing tools.

At the beginning, it was mainly to create new terrains, as SHIFT+F1 feature of in-game track editor was not known. Then, they became more and more "real" track editors, and some of them allowed to create funny tracks not possible to create with in-game track editor, like bug tracks or illusion tracks.
Here is the list of external track/terrain editors :