OpenCart might be one of the best looking e-commerce scripts out there today. It is a robust shopping cart solution for anybody out there that wants to host their own good looking and functioning online store. For the online merchant that wants to get a good store with an easy setup, OpenCart is worth to having a look at. Using OpenCart is very easy. You just install OpenCart on your hosting account, select the template you want to use, add your categories and products and you are ready to start accepting orders. It is also open source (free) to use, so even if you are just looking around, there is no harm in installing it and seeing if you like it or not.
Payment modules v4
Payment modules v3
Payment modules v2
Payment modules v1.5
Payment modules v1.4
XML Feeds
Store Builder
SEO Tools