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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.
Edit: This framework also looks interesting, SDL based https://github.com/UnGast/swift-gui
You may be interested in this project which allows you to program with SwiftUI on the web. You can try it here.
Also check out this project by a member of the Swift core team, which is a set of bindings for the Win32 API for Swift on Windows.
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.