
Announcements
For example LibreOffice Base, Google Tabellen or Gnumeric.
They are not in the native list of connectors available, however you can theoretically use any datasource - if you write a custom connector for it or it has an API, then you can use the Power Platform products to interact with it.
Custom Connectors:
Custom connectors overview | Microsoft Learn
List of existing connectors:
List of all Power Apps connectors | Microsoft Learn
Cheers,
Sancho