There is a free version where you can only install two apps and have five users: https://cloudron.io/pricing.html https://cloudron.io/pricing.html But it's op

There is a free version where you can only install two apps and have five users: https://cloudron.io/pricing.html https://cloudron.io/pricing.html But it's open source, so if you can life without the automatic updates and the app store (install apps and updates manually through their cli utility) you can still install more apps.