An open source developer's guide to 12-Factor App methodology: 
The 12-Factor App methodology provides guidelines for building apps in a short time frame and for making them scalable. It was created by the developers at Heroku for use with Software-as-a-Service (SaaS) apps, web apps, and potentially Communication-Platform-as-a-Service (CPaaS) apps. For organizing projects effectively and managing scalable applications, the 12-Factor App methodology has powerful advantages for open source development.
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