Enjoy.

Juvenile. As far as I can tell it has no real connection to anything besides character names, but it features Jazz, Eva and Lori, along with characters from several other games, in a high school/college setting. Pregnancy and TEENAGE DRAMA!
Diamonda Mask. Jazz and Sonic (mostly Sonic) crossover, plus some OC's I don't know much about. Not much like our typical characterizations, but the author evidently knows the plot of both JJ1 and JJ2 and it's an interesting enough read if you like warrior!Jazz.