Hey, I don’t think there are many people working on 2D games with Jme but anyway I thought it could be useful for one of these people.
I made it for my 2D game which also uses Jme.
Project hosted at: http://code.google.com/p/kollider2d/
Can you compare it to e.g. Phys2D?
I'm afraid there is no physics, it's supposed to be very simple to use and only for managing collisions between polygons or between groups of polygon. There is no principle of "stepping" in function of a delta time so it can give more flexibility. There's a short feature list on the google code project.
Neway it was supposed to be just a "tool" for my game 