In Europe... Finnair in Finland MD80 and DC9 sims available.
www.finnair.com In US... Higher Power Aviation HPA from Dallas, Texas. Type done in MD80 sim with AA. In US Both DC9 to MD90 fall under same type rating requiring differences training between the -9 ,-80 and -90. I am not sure if B717 is a different type.
www.jetcrew.com
There are a few others around.
Cheers
JJ