The spark_api gem handles most of the boilerplate for communicating with the Spark API rest services, including authentication and request parsing.

A Devise extension to use passkeys instead of passwords for authentication, using warden-webauthn

Devise based user authentication for AlchemyCMS.

Allows applications using Train to speak to AWS; handles authentication, cacheing, and SDK dependency management.

Ruby wrapper for the Angellist API. The AngelList API provides developers with a RESTful interface to the AngelList data set. Some endpoints are public and require no authentication.

Rails-API authentication solution based on JWT and inspired by Devise.

A gem providing Rails with authentication, Facebook Connect, MadMimi, and DelayedJob support

An easy drop in solution for rails to use GitHub authentication.

A library for generating signed authentication tokens for use with Firebase. Uses your app secret.

Authentication plugin for the Trestle admin framework

minimalistic authentication

simple FreshBooks API wrapper. supports both OAuth and API token authentication

Rack middleware that provides authentication based on JSON Web Tokens.

dm-devise adds DataMapper support to devise (http://github.com/plataformatec/devise) for authentication support for Rails

A protobuf-inspired minimalistic serialization format with cryptographic authentication

Parse Server Ruby Client. Perform Object-relational mapping between Parse Server and Ruby classes, with authentication, cloud code webhooks, push notifications and more built in.

Implement basecamp style subdomain authentication with support for multiple users under a single subdomain scoped account.

Support authentication via OAuth2 tokens dispensed from the Doorkeeper authorization flow

OTP (email, SMS) JWT authentication for HTTP APIs.

OmniAuth support for multiple providers of an authentication strategy