CloudFoundry User Account and Authentication (UAA) Server
MaxKey SSO ,Leading-Edge IAM-IDaas(Identity and Access Management)
The Single Sign-On Multi-Factor portal for web apps
Apereo CAS WAR Overlay template
Doorkeeper is an OAuth 2 provider for Ruby on Rails / Grape
A private certificate authority (X.509 & SSH) & ACME server
Identity & Single Sign On for all earthlings and beyond
Apache LDAP Directory Manager
Token based authentication module for angular.js