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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.
Check out https://github.com/instaunit/instaunit. It lets you define the calls to be made and expected responses and will compare them semantically so you can match on expected fields without worrying about things like dates and IDs that you can't predict easily. It can also be used to generate documentation for your APIs which is awesome because your docs are then built from your tests so you know they are current and accurate.
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.