Currently RA-4 is the only process available for printing from color negatives.

From Kodak, before RA-4 there was Ektaprint 2 for home use and before that Ektaprint C, both with longer processing times.

My memory on this is a bit hazy on this but I believe at one time, someone, I think Unicolor had a process for color negative printing papers known as Type B or Type RB or something like that, different from the concurrent Ektaprint 2.