PacketFence - PacketFence is a Free and Open Source network access control (NAC) system.
Okta - Enterprise-grade identity management for all your apps, users & devices
Fing - Discover which devices are connected to any Wi-Fi network, map devices, detect intruders, assess...
Auth0 - Auth0 is a program for people to get authentication and authorization services for their own business use.
OneLogin - On-demand SSO, directory integration, user provisioning and more
Atlassian Crowd - Crowd is a single sign-on and user identity solution.