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Re:Shopify to raise $100M in Toronto, New York IPO by bhouston on Tuesday April 14, 2015 @08:56PM (#9378296)
Some competitors:

Magento / Magento Go oscommerce woocommerce etsy squarespace prestashop opencart Wordpress has shopping chart as well.

There are a ton of existing POS providers for stores, more than one can name.

Re:Shopify to raise $100M in Toronto, New York IPO by girvo on Wednesday April 15, 2015 @03:59AM (#9379473)
Magneto and OSCommerce are nowhere near competitors IMO, at least in terms of using them as a developer. I still get fever dreams about Magento...