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- OS Shop is a professional grade shopping cart that has many SEO features built in, including standards compliant HTML. OS Shop can be configured to sell any type of product, from the simple to complex. OS Shop features numerous payment and shipping modules as well as an advanced tax structure. The software uses a template system, which makes it simple and quick to apply your design to the store. This software was originally used in-house at CRV Designs, but we''ve decided to release it for free.