This is all Kodak, which is the total experience of most of us. I am old enough to remember (just barely) Kodachrome prints that looked like they were on a white opaque film base. Nobody has mentioned those here. I can also remember the similar Ansco Printon, which could be processed at home or in independent labs. After it, there were several paper based products from just about everyone (Ansco, Agfa, Mitsubishi, Ferrina, and many others) . These often were coupled with proprietary processing materials. About the time of Ektaprint 2, the other manufacturers began to standardize on the Kodak processes for color negative printing. I suspect many of them rebranded Kodak paper. Reversal printing was still specialized, and only a few papers existed, mostly for only a short time.