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flet
Flet enables developers to easily build realtime web, mobile and desktop apps in Python. No frontend experience required.
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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.
Something to keep a watch on would be flet. It uses flutter to make the UI. It does not do mobile apps yet (only web and desktop I think) but it is on the roadmap.
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.