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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.
This is far fetched - It simply should NOT be written in unreal engine. Come on, Unreal Engine already depends on C#, if you are trying to save time, why not write a GUI in C#? I found Avalonia (https://avaloniaui.net/) quite promising.
Here is the page: https://github.com/Heroic-Games-Launcher/HeroicGamesLauncher
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Hence, a higher number means a more popular project.