Keycloak - Open Source Identity and Access Management for modern Applications and Services.
Git Flow - Git Flow is a very self-explanatory free software workflow for managing Git branches.
Zentyal - Linux directory, domain, mail, gateway and infrastructure server for SMBs.
Working Copy - The powerful Git client for iOS
OpenLDAP - OpenLDAP Software is an open source implementation of the Lightweight Directory Access Protocol.
Git-Repo - Manage Gitlab, GitHub and Bitbucket from the command line