Web-based LDAP address book browser/editor
Zentyal is a Linux Small Business Server
apache cookie SSO mechanism.
hook pam to authenticate users against anything
Apache LDAP Directory Manager
Facebook authentication strategy for Passport and Node.js.
Token based authentication module for angular.js
PHP User Login and Management System based on Codeigniter
An extensible authentication and authorization library for Clojure
Two-factor authentication for Node.js
NTLMv2 authentication library and filter for Java
Authentication, Access Control, and Single Sign-On
Two-factor authentication system
The Identity Manager provides a solution to manage the user life cycle
Username and password authentication strategy for Passport and Node.js
Open Source Web Single Sign-On
SSH Key Management solution