Apereo CAS - Enterprise Single Sign On for all earthlings and beyond.

An authorization library that supports access control models like ACL, RBAC, ABAC in Golang

The authorization Gem for Ruby on Rails.

Doorkeeper is an OAuth 2 provider for Ruby on Rails / Grape.

An open source, general-purpose policy engine.

A binary authorization system for macOS

OAuth Proxy

Eloquent roles and abilities.

CASL is an isomorphic authorization JavaScript library which restricts what resources a given user is allowed to access

Simple user-authentication solution, embedded into a small framework.

A generic, spec-compliant, thorough implementation of the OAuth request-signing logic

Security engine for Java (authentication, authorization, multi frameworks): OAuth, CAS, SAML, OpenID Connect, LDAP, JWT...

Handle roles and permissions in your Laravel application

Role and Attribute based Access Control for Node.js

A distributed single-sign-on framework.（分布式单点登录框架XXL-SSO）

A framework agnostic authentication & authorization system.

*CURRENTLY UNMAINTAINED*. Authority helps you authorize actions in your Rails app. It's ORM-neutral and has very little fancy syntax; just group your models under one or more Authorizer classes and write plain Ruby methods on them.

StarHackIt: React/Native/Node fullstack starter kit with authentication and authorisation, data backed by SQL.

Full Stack Polls App built using Spring Boot, Spring Security, JWT, React, and Ant Design

An Elixir Authentication System for Plug-based Web Applications

An authorization library that supports access control models like ACL, RBAC, ABAC in Node.js

An authorization library that supports access control models like ACL, RBAC, ABAC in Java

Awesome Django authorization, without the database

Simple yet powerful authorization / authentication client library for Python web applications.