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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.
There is also gui-easy a declarative gui framework: https://docs.racket-lang.org/gui-easy/index.html
Some simple examples using the Racket gui toolkit can be found at https://github.com/mfelleisen/7GUI
PS this is a macOS app with the GUI made with swift https://github.com/Bogdanp/remember/tree/master/cocoa/remember/remember but the backend is Racket.
To try it out got to https://racket-lang.org to download and install for your platform.
NOTE:
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Hence, a higher number means a more popular project.