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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.
Haven’t used Intra before but it looks like it uses Google’s Firebase analytics (https://github.com/Jigsaw-Code/Intra/blob/master/Android/app/src/main/java/app/intra/sys/firebase/AnalyticsWrapper.java) (no surprise though since Intra is by Google (Jigsaw team)).
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Hence, a higher number means a more popular project.