This is, hopefully, a complete list! If I forgot someone, a thousand pardons to that unlucky person/organization. I'll remedy it when feasible.

Kismet: Privateer Credits
Enterbrain for the majority of resources and of course the engine.
Yanfly, for his Ace Engine Scripts, without which this game would not be possible.
Archeia_Nessiah for character portraits and facial expressions.
Devil Soul Music (maoudamashii) for original music.
Closet Material Index for monster graphics and some sprites.
Mithran for his Text Cache Fix script.
Craze for his Accuracy Overflow script.
Raziel for the current title screen (probably a placeholder).

I think that's all, folks!