Want to sell online? Not Your Average Geeks blog has reviewed nine of the best, including last year.
On Magento, the review notes:
...[M]y what a fantastic job they have done on this product. It's by far one of the more exciting e-commerce platforms available for free on the market today. Dripping with features, they really have thought of everything. Wishlists, shop by price and category, item comparison - all the things we've come to expect from professional web stores. It's software as good as this that really keeps licensed software on their toes...
Indeed. Take a look at the other reviews. A good collection of great software.