pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more
Keycloak - Open Source Identity and Access Management for modern Applications and Services.
OPNsense - OPNsense® you next open source firewall. Free Download. High-end Security Made Easy™. Offers Intrusion Prevention, Captive Portal, Traffic Shaping and more.
Zentyal - Linux directory, domain, mail, gateway and infrastructure server for SMBs.
IPFire - IPFire is a server distribution with intended to use as a firewall.
OpenLDAP - OpenLDAP Software is an open source implementation of the Lightweight Directory Access Protocol.