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JsonApiDotNetCore
A framework for building JSON:API compliant REST APIs using ASP.NET and Entity Framework Core.
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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 a great, thorough and in-depth document from Microsoft: https://github.com/microsoft/api-guidelines/blob/vNext/Guidelines.md
There's also this spec, which is a good read: https://jsonapi.org/
NOTE:
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Hence, a higher number means a more popular project.