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ObservableCollections
High performance observable collections and synchronized views, for WPF, Blazor, Unity.
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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.
Not entirely sure how well it’ll fit your use case, but this is the first library that comes to mind that I’ve used with an ObservableDictionary. It is ObservableCollections by Cysharp.
NOTE:
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Hence, a higher number means a more popular project.