One Time Password Authentication package, compatible with Google Auth
A private certificate authority (X.509 & SSH) & ACME server
Robust, modular, and extendable user authentication system
Doorkeeper is an OAuth 2 provider for Ruby on Rails / Grape
An open-source Identity and Access Management (IAM)
Identity infrastructure, simplified for you
The Single Sign-On Multi-Factor portal for web apps
The authentication glue you need
Open source auth infrastructure for B2B SaaS
Kanidm: A simple, secure, and fast identity management platform
Identity and access management for modern applications and services
PHP strong authentication library, web interface & CLI, OATH certified
A Java-based LDAP API
Collate and count ldap entries
Extrect selected entries from LDIF files like grep
Replace/add/delete LDAP attributes online with regular expressions
IDaaS/IAM solution that can Auth to web and mobile applications
Zentyal is a Linux Small Business Server
An extensible authentication and authorization library for Clojure
Two-factor authentication for Node.js
Replicates POSIX user credentials over the Internet - NIS replacement
Plugin for OpenLDAP who checks password quality