Well short answer is any.
long answer is that it uses directX ( HID ) So any DX based plugin will work, and has. I use my adapter with just about all of them I come across. With xpadder you can fill in the gaps where the pluggins give you trouble. Also this is part of beta'ing it. I want to know what does not work as I personal feel it will work with everything. I choose not to use a driver thus using HID and HID is a generic driver windows understands. So its trouble free. Works great with the dolphin plugins btw
NOTE: keep in mind this adapter is made for the person that wants many adapters in one. If you want a single version I make those, so contact me. I plan to re-create that adaptiod but dont have time just yet.