Keycloak - Open Source Identity and Access Management for modern Applications and Services.
PuTTY - Popular free terminal application. Mostly used as an SSH client.
Zentyal - Linux directory, domain, mail, gateway and infrastructure server for SMBs.
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
OpenLDAP - OpenLDAP Software is an open source implementation of the Lightweight Directory Access Protocol.
iTerm2 - A terminal emulator for macOS that does amazing things.