Add a Cache-Control header to your static assets

Canvas LMS OAuth flow for Sinatra

Chassis is a mutable framework extension for Sinatra that's designed to help you focus on less code by writing less code.

Documents and validates sinatra api requests

Comet component for Sinatra RocketIO

Sinatra Conditions gives you the ability to use additional conditions.

Small Sinatra extension to add a content_for helper similar to Rails'

Rack middleware to disable cookies when static content is being served, which can prevent caching on some HTTP accelerators (Varnish).

Create documentation for an API built in Sinatra.

A Sinatra Extension that makes working with CSS easy.

Cache extension on Sinatra

helper.

A quick and simple way to set defaults for the params helper on a per route basis.

Saves you from having to write routes just to render templates with the same name. Rails-style.

Sinatra can be aynchronous and provide WebSockets using Thin and Skinny.

Drop in disqus to any Sinatra view via a handy helper.

Sinatra Extension for working with DataMapper (another Sinatra-Sequel Rip-off)

Tools for creating a simple web API

Provide autoloading of Model classes and Controller for sinatra to allow for simpler writing of MVC web applications.

Define your params schema with the strong library dry-schema.