It wasn't a homebrew, it was a cfw, and it only works if you have a 3ds that is on system firmware <=4.5I saw some news about an hombrew used to add plugins to a 3DS rom.
Maybe we can Stream capture by network. with some fast transfert protocol .
AFAIK RemoteJoy used functionality built in to the PSP, it simply switched the PSP into a "Mode B" USB that had video transfer and used a custom PC client to take advantage of it.OBJECTION!
RemoteJoy for the PSP did pretty well on this job. Only one game I played with RemoteJoy enabled had lags. And that game was Vice City Stories. Every other game worked fine.
But the 3DS lacks a USB-Port and therefore it won't be that easy to get anything on another screen... and Wi-Fi might be too slow (or you had to compress the data, which would actually mean a cpu drag).
Until someone really digs into that, I will stick to my $200+ Capture Card.^^