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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.
Personally, I've been more of a fan of czkawka as I prefer to use Rust-based app (primarily since they're often newer so unburdened by old designs) though it isn't like I'm against using python, electron, (insert other unpopular framework here) if it's the best option.
I think BleachBit is generally what is recommended now, which is open-source.
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.