Users: FreeIPA, Active Directory (via SSSD)

Configuration: Saltstack, Puppet, Chef, etc…

Fileshare: SFTP with Gravitational Teleport, or SMB via Kerberos.

Remote Access: SSH, SSH-tunneling VNC, Rustdesk, NoMachine, Cockpit.

Chat: Mattermost, Signal.

Documentation: Wiki.js, Gitlab knowledgebase, Netbox, Draw.io.

Monitoring: Zabbix, Uptime Kuma, Prometheus/Grafana.

Virtualization: KVM-Cockpit/Virtmanager, Docker/Podman, UnRaid.