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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.
I keep meaning to give https://github.com/ParthJadhav/Tkinter-Designer a try.
For very simple desktop apps, try gooey which lets you define GUI applications pretty much how you might define a CLI app, i.e. using argparse (and can do so automatically for existing CLIs built on argparse)
There's also work on osx/ios themed widgets https://github.com/cmdvmd/kivy-cupertino. Still in the beta phase and could use a lot of work but there could be some promise there.
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