A spec compliant, secure by default
Doorkeeper is an OAuth 2 provider for Ruby on Rails / Grape
FIDO® Certified StrongKey FIDO Server (SKFS)
Daemon to ban hosts that cause multiple authentication errors
Zentyal is a Linux Small Business Server
apache cookie SSO mechanism.
Apache LDAP Directory Manager
NTLMv2 authentication library and filter for Java
Two-factor authentication system
Single Sign On module for Apache and NGiNX
LDAP backend for VirtualBox RDP Auth
Deprecated project - see http://wordpress.org/extend/plugins/wpmuldap/