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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Authenticator: Aegis (F-Droid | GitHub ). This provides the same (or more) features of Google Authenticator, and it's open source.
Email: You can use either FairEmail (F-Droid | GitHub or K-9 Mail (F-Droid | GitHub ). In both clients you can add a gmail account through IMAP. The advantage is that you won't need any Google Services installed but you will still be able to access your gmail account.
Email: You can use either FairEmail (F-Droid | GitHub or K-9 Mail (F-Droid | GitHub ). In both clients you can add a gmail account through IMAP. The advantage is that you won't need any Google Services installed but you will still be able to access your gmail account.