I was using Nextcloud with OnlyOffice for a while, but since then, this is the setup:
- YouTube --> Invidious/Odysee/PeerTube
- Authenticator --> Stratum
- Google Passwords --> Vaultwarden
- Gmail/Calendar/Tasks --> Privateemail (through domain host)
- Google Drive --> Syncthing/SFTPGo (webdav implementation handles phone backups, too)
- Play Store --> Aurora and F-Droid
- Google Search --> SearXNG
- Google Home --> HomeAssistant
- Google Photos --> Immich
- Google Books --> Kavita
- Android Messages --> KDE Connect
- Google Maps --> Organic Maps or Magic Earth
- Google Meet --> Element
- Google Pay --> PayPal
- Google Voice --> Session
- YouTube Music --> gonic