HackerEngine is a Rails app designed to sell digital goods.

HackerEngine uses

• Stripe for payments
• Twitter’s Bootstrap CSS for layout design
• KISSmetrics for click analytics
• FetchApp for delivering digital goods

HackerEngine may be customized for various e-commerce purposes, not just the selling of digital goods. For example, it may be customized for selling physical goods or services.

One of the best features of HackerEngine is that, once purchased, future updates may be downloaded in real time through its Github repository. Hence new functionality may be fetched and used immediately. Futhermore, the app is covered by a thorough test suite.

I love the idea of having the basic feature set ready to use, and then customizing it for your needs.

HackerEngine was created by Ben Orenstein and Chad Mazzola.

Reference: http://hackerengine.com/