Yamaha HS line of monitors are rear ported.  I am sure there are others.

FWIW, Bob Katz says ported speakers are a no no.

Bristol_Jonesey
Most monitors by Adam are front ported

 
KRK too.

Yamaha MSP series is front ported.

I have a pair of these 80's era Tannoy System 8 NFM II speakers with concentric drivers.  I picked them up a few years ago and had them re-coned.  The are front ported (2 cylindrical ports) ... great speakers.
 
Also, I have a pair of first generation KRK Rocket 8's.  Also front ported (a wide slot) ... good speakers but a bit more on the cheap thrill side.
 
Bob Katz is not the only one who says ported speakers are a no - no.  The debate over the acoustic suspension (sealed) vs. bass reflex (ported) designs goes back to the original AR speakers of the 1950's.