Disclaimer: I am a Shopify employee.
Backstory: Shopify.com was recently ripped off as Shopqi.com – the job was pretty impressive! They copied our brochure, wiki, theme store, and from the look of their Rails app, a good chunk of our domain models too. Nice to see the Chinese version of Active Merchant as well.
The author of the ripoff posted the source on http://github.com as open source: https://github.com/saberma/shopqi
Tobi, Shopify CEO, decided to make a pull request in response.