[RickS]

Disclaimer: I have no stats to back this up, at all. Just been in the game awhile.

The entry level commerce space (shopify, opencart, woocommerce, etc) always feels overcrowded, but few things really nail it.

Opencart is the only truly free service that's a contender, and it's terrible. Granted - ecommerce, especially security, is very difficult, and asking for that in a free product is lofty.

If you can build a commerce platform that's as low-investment as opencart (read: free) with the UX quality of shopify, and just let it into the wild, you can make an absolute killing by owning the plugin and template market associated.