LTSP - The Linux Terminal Server Project adds thin-client support to Linux servers.
Keycloak - Open Source Identity and Access Management for modern Applications and Services.
Thinstation - Thinstation is a basic and small, yet very powerful, open source thin client operating system...
Zentyal - Linux directory, domain, mail, gateway and infrastructure server for SMBs.
linuxmuster.net - linuxmuster.net is a comprehensive complete solution for the operation of school IT infrastructure.
OpenLDAP - OpenLDAP Software is an open source implementation of the Lightweight Directory Access Protocol.