I am currently trying to, although, not particularly actively, trying to find a good repository for DESFire applets, that I can link to in the Handy Dandy thread.
so if anybody knows of one or if you have built some of your own you are willing to share, please let me know.
I am not sure if some of the Apex Applets can be sideloaded onto Desfire chips, 
AMAL!?
I actually hope that there will one day be a library / applet store hosted on Amals Server that we access for our DESFire implants