Magento

Magento is one of the best opensource cart which is acquired by eBay recently. With 110,000+ users it is most popular opensource cart in the market. With most of the eCommerce functionality available with strong community team it is one of the most recommended free carts available.

Features

Catalog

Guided/Faceted Navigation

Catalog management

Inventory Management

Sell Downloadable products (eDelivery)

Product Compare

Custom Attributes

Promotions/Discount rules

Product reviews

Bundled/Group products

Checkout

Create order from backoffice

One page checkout

Continue as Guest

Expire Abandoned carts

Shipping

Split shipping

Fee by Order total and Weight

Integration with UPS, USPS, Fedex, DHL

Gift wrap and Gift message

Payment

Credit cards, Amazon, Paypal and more

Google checkout Level 2

Configure Taxation by country, states, federal, province taxes and more

Customer

Loyalty program

Order History

Customer Service

Customer Orders (status of delivery, cancel, refund etc)

Customer Information (name, phone, email)

Internationalization

Multi Language

Multi Currency

Localization

SEO/Marketing

Meta tags

Title

Friendly/Custom URLs

SiteMap

Landing page tool

News letter

Emails

Order placed

Delivery Status

Cancellations

API

APIs for most of the functionality are available