SuPPort is an event-driven server framework designed for building scalable and maintainable services and clients. It's a distillation of the Python Infrastructure used at eBay and PayPal to host a wide range of services for dozens of teams, and has served billions of production requests (as of 2015). It took a fair bit of effort to open-source, everything from major refactoring and cleaning git history to conferring with legal/branding and designing a logo. Read more on the announcement blog post: https://www.paypal-engineering.com/2015/03/17/introducing-support/