I've never looked for such a thing, actually. It seems (from its website) that it is just an e-commerce program with the shopping cart functionality stripped out but, not having seen it in action, that is only a educated guess about "what is does" based on their claims.
I'll admit I'm a little (a lot) dubious of all their SEO related claims, which is one of the things they seem to claim it does that others don't), but - meh, who knows?
You could actually use a Joomla! installation very well for an e-catalog, or even a ZenCart (just don't enable the shipping/payment options.)
Maybe someone else has some suggestions for you.