A Java-based LDAP API
PHP strong authentication library, web interface & CLI, OATH certified
Simple, unobtrusive authentication for Node.js
OAuth 2.0 authorization server toolkit for Node.js
Apache LDAP Directory Manager
Mature LDAP, LDIF and DSML client with i18n support.
DBIS Reference Implementation
Plugin for OpenLDAP who checks password quality
Open Source Web Single Sign-On
Proxy Manager that integrates AD with Squid using SSO
Add LDAP user authentication in MySQL