Doorkeeper is an OAuth 2 provider for Ruby on Rails / Grape
FIDO® Certified StrongKey FIDO Server (SKFS)
Insert and manage Linux computers in AD
PHP strong authentication library, web interface & CLI, OATH certified
Webbased Small Business Server
Zentyal is a Linux Small Business Server
apache cookie SSO mechanism.
hook pam to authenticate users against anything
Apache LDAP Directory Manager
An open source Identity & Access Management solution with AD-functions
two factor authentication management system
NTLMv2 authentication library and filter for Java
Authentication, Access Control, and Single Sign-On
Open Source Web Single Sign-On
LDAP backend for VirtualBox RDP Auth
Deprecated project - see http://wordpress.org/extend/plugins/wpmuldap/