A lightweight authentication extension for Sinatra with PostgreSQL -- longer description

A sinatra extension that provides authentication for GMail authentication

A sinatra extension for easy oauth integration with oauth providers

Smooth authentication-agnostic rule-based authorization extension for Sinatra

A auth token for sinatra

Sinatra extension to automatically recompile all your sass/scss files everytime your application starts

A Sinatra plugin that allows encoding requests and responses using Apache Avro

Extends Sinatra with some convenience shortcuts.

This gem is a fork of sinatra-twitter-bootstrap remade for bootstrap 3. Usable, though still somewhat of a work-in-progress. Check the homepage for details.

Bouncer brings simple authorization to Sinatra.

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

Better Compass integration for Sinatra (part of BigBand).

Sinatra Conditions gives you the ability to use additional conditions.

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

Adds controllers to Sinatra

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