Feathers is a batteries included but entirely optional minimal web application framework.
At its core, Feathers is a set of tools and an architecture pattern that make it easy to create scalable REST APIs and real-time applications. With Feathers, you can literally build prototypes in minutes and production-ready apps in days.
Feathers achieves this by being the glue code between some amazing battle-tested open-source technologies - adding a few minimal abstractions and introducing an application architecture that is easier to understand, maintain, and scale than the traditional MVC architecture.
If you're interested, you can read more about how and why Feathers came to be or find out more about its features and how Feathers compares to others.
If you've decided that Feathers might be for you, feel free to dive right in and learn about the basics.
You can find this documentation as a PDF here.