CyanoPSP

[vnctdj]

I have updated your first post

PPSSPP do supports multiplayer, look at this subforum
In fact, PPSSPP allows ad-hoc mode (even if we are extending it as we can play through the Internet), the thing that is not supported yet is the infrastructure mode.
That's why you can play with other people but you can't download in-game DLCs, for example...