Doorkeeper is an OAuth 2 provider for Ruby on Rails / Grape
A simple, personal OpenID provider written in PHP
Identity management and federations integration
A Java-based LDAP API
FIDO® Certified StrongKey FIDO Server (SKFS)
PHP strong authentication library, web interface & CLI, OATH certified
sed-like modify and convert LDIF files using regular expressions
Extrect selected entries from LDIF files like grep
Replace/add/delete LDAP attributes online with regular expressions
Zentyal is a Linux Small Business Server
Tomcat SPNEGO/Kerberos Authenticator and Active Directory Realm
apache cookie SSO mechanism.
hook pam to authenticate users against anything
Apache LDAP Directory Manager
JNDI DirContext source builder utility