Authentication and Authorization Libraries

Json Tokens to authenticate and transmit information.

A Twitter OAuth library.

An OAuth 2.0 client library.

Platform-Agnostic Security Tokens.

A multi-provider authentication framework.

Another OAuth library.

An OAuth 1.0 client library.

An open source social sign (OAuth1\OAuth2\OpenID\OpenIDConnect).

Provides authentication functionality and session tracking using various adapters.

Another OAuth2 server implementation.

An OAuth2 authentication server, resource server and client library.

A library for social network authentication.

A framework agnostic authentication & authorisation library.