The AuthLane Sinatra Extension allows simple User authentication with support for different User roles. It comes with Sinatra helpers for easy integration into routes.

Single Sign-On implementation based on HMAC.

"Authenticate developpers and applications."

A many-stop shop for authentication.

HTTP request signing and validation library with support for header signing and multiple backends.

Rails engine to add IndieAuth authentication endpoint functionality

A description of a really simple authorization plugin for Rails.

A command line OAuth authorization tool.

A gem for rails giving vast flexibility in authorization management.

Deprecated in favor of indieweb-endpoints from 2019-04-24. Discover a URL’s authorization endpoint for use with Micropub and IndieAuth clients.

Parses parametrized HTTP Authorization headers

Client provider library for the authorization service

Really secure and simple authorization library for your Rails, Sinatra or whatever web framework, which just works.

Ruby Gem for integrating Authorize.net Customer Information Manager (CIM)

Library to manage authorized_keys files

Creates scaffolds for Twitter Bootstrap with generated RSpec coverage

authorize_link(link,controller,action)

Ruby Library to interact with the Authorize.net Transaction Details API

Rule Based Access Control gem for Ruby on Rails applications

Authorization that includes basic authorization and 3 social authorization with Latvia social network draugiem.lv, facebook.com and twitter.com.