Some states still use their own names for them (iPass in IL is the first one that comes to mind), but most toll facilities on the east coast and midwest are compatible with EZPass now.

TX, OK, KS, CA, CO, and that one little shit bridge in Nassau County are some notable places with tolls that don't take it.

EZ Pass map from Wikipedia.

Edit - The Margate bridge by Atlantic City doesn't take EZPass either apparently. I thought I saw an article a few years ago they were going to start taking it. Guess not.