BotDelive is a Push Notification and 2-factor authentication API service that works over the chat bots (Telegram and Messenger).

rack middleware providing session based authentication

Static authentication && authorization in rails.

A ruby implementation of RFC4493, RFC4494, and RFC4615. CMAC is a message authentication code (MAC) built using AES-128.

As fate would have it, I found other authentication solutions unable to suit my needs. So I rolled my own, totally supporting Rails 2 AND 3.

OAuth 2.0 authentication and API calls for Rdio Web Service API.

A gem to safely provide external application resources with a coherent and configurable API to a host application's authentication procedures.

Non-password Authentication with Facebook Account Kit for Rails app

HTTP dialog for the Acenda API with the oAuth2 authentication.

Action Interceptor provides methods to store return url's across multiple requests. Useful during authentication, registration, signing terms of use, etc.

CLI tool to obtain certificates via ACME and update the matching TLSA records. The primary authentication method is http-01 via webroot for now, but dns-01 is supported too.

Ruby/NTLM HTTP provides NTLM authentication over http.

Oauth authentication for bombbomb.

An authentication and authorization system for Rails

A flexible authentication and authorization framework for Rack applications.

Simple authentication for Rails

AlterEgo is a Ruby gem for integrating two-factor authentication into your web application.

An authentication bootstrapper for your Rails application.

Users, Authorization and Authentication for Isomorfeus.

The gem will handle adding API tokens to your user account, and handle the authentication of incoming requests.