They are a bit like umbrel or start 9 but for small to medium sized companies.

You can point & click deploy a range of apps, including email / nextcloud / vpn / mirotalk / matrix / gitlab / gitea etc and it handles the DNS updates, app updates, logs, alerts, security and everything

All on your own infrastructure

German company (so they care about data privacy), don't take bitcoin but maybe if enough of us ask??

Highly recommended.