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Zentyal - Linux directory, domain, mail, gateway and infrastructure server for SMBs.
Keycloak - Open Source Identity and Access Management for modern Applications and Services.
ClearOS - A very good alternative for Windows Server, for free
Linux Schools - Linux Schools consists of Karoshi Server and Karoshi client.
OpenLDAP - OpenLDAP Software is an open source implementation of the Lightweight Directory Access Protocol.
SME Server - SME Server is a leading distribution for small and medium enterprises.