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Xamarin
.NET for Android provides open-source bindings of the Android SDK for use with .NET managed languages such as C#
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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.
I read that Broadcast Receiver is no longer guarenteed to trigger on exact times. Which doesn't really matter for my purpose, but seemed to me to be an indication that this wasn't quite what I was looking for.
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Hence, a higher number means a more popular project.