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Windows UI Library
Windows UI Library: the latest Windows 10 native controls and Fluent styles for your applications
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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.
Nope - that would be a massive undertaking. Someone tried reimplementing SwiftUI but it was abandoned quickly after realising how much work it would entail: https://github.com/Cosmo/OpenSwiftUI
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Hence, a higher number means a more popular project.