This is a simple reverse proxy for Rack. It is not meant for production systems (although it may work), as the webserver fronting your app is generally much better at this sort of thing.

A Ruby and Rack-based web framework

Synapse is a web application framework that does practically nothing. Basically this is just a tiny wrapper for the Rack::Router (see http://github.com/carllerche/rack-router) very alpha-ish stuff here. Seems to work though.

Synfeld is a web application framework that does practically nothing. Synfeld is little more than a small wrapper for Rack::Mount (see http://github.com/josh/rack-mount). If you want a web framework that is mostly just going to serve up json blobs, and occasionally serve up some simple content (...