serve

Serve is a small Rack-based web server and rapid prototyping framework for Web applications (specifically Rails apps). Serve is meant to be a lightweight version of the Views part of the Rails MVC. This makes Serve an ideal framework for prototyping Rails applications or creating simple websites. Serve has full support for Rails-style partials and layouts. Maintained by jlong on GitHub, where it has earned 825 stars from the community.

It's actively developed around rails, ruby, webserver, and is a solid reference for anyone building with these tools.