OX provides alternatives for Gmail+contacts, Google Calendar, Google Drive, Google Docs/Sheets/etc. I remember it having chat and calling capabilities too, but

OX provides alternatives for Gmail+contacts, Google Calendar, Google Drive, Google Docs/Sheets/etc. I remember it having chat and calling capabilities too, but on github their messenger is marked as archived and the mobile app seems to have been taken down, so I'm not so sure about that.