There's a list on Reddit, but it's pretty slim pickens. Can anyone confirm that other controllers will work on the system, and if so, which ones?
https://www.reddit.com/r/VitaTV/comments/4ft7c7/compatible_and_non_3rd_part_controller_list/
https://www.reddit.com/r/VitaTV/comments/4ft7c7/compatible_and_non_3rd_part_controller_list/