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Avalonia
Develop Desktop, Embedded, Mobile and WebAssembly apps with C# and XAML. The most popular .NET UI client technology
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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.
https://github.com/Fody/PropertyChanged and Android background makes WPF pretty easy. At least the surface level stuff.
Also if you don't need to specifically use WPF, I'd suggest to try Avalonia. It's kinda the same, but with many quality of life improvements that make it easier to use. Styling is less painful and more akin to CSS (will help if you're familiar with web development).
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.