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Cutelyst
A C++ Web Framework built on top of Qt, using the simple approach of Catalyst (Perl) framework.
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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.
Brewfather can import/export JSON, but in its own custom format. There's an open feature request to support BeerJSON that may get some attention if it's upvoted (requires login to vote).
could do both! https://cutelyst.org looks neat, and BrewTarget is written with Qt.
NOTE:
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Hence, a higher number means a more popular project.