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LeanQt
LeanQt is a stripped-down Qt version easy to build from source and to integrate with an application.
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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.
If you (like me) don't need all that stuff and are not up to the latest craze, have a look at LeanQt (https://github.com/rochus-keller/LeanQt).
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.