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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.
Not familiar with OnlyOffice, but you could block all network activity for it. On Linux, the easy way to do this is using Flatpak's sandboxing. Get the app via FlatHub and use Flatseal to remove its network permission. Flatseal can also be used to remove access to files you don't want it touching.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.