I wanted to make a post about the open-source (free) e-commerce cart called 'Opencart'. I have tried several e-commerce carts. I have tried hosted, and I have hosted them myself. Here is my opinion.
For the price (free) and the amount of add-on features available (some for free many for a minimal price), I think opencart is by far the best option, especially for newbies or small retailers.
My only question for other users is: does your cart solution do well with search engines? At this time, I am not sure if it's because google is always changing, or if some carts do better with seo/indexing? I actually have 'seo' add-ons to make all pages friendly, but compared to past carts I have used, opencart is not #1 in this category.