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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.
If you love doing hands-on project, I recommend you to look at the existing awesome Rails app. You will learn a lot, and learn what matters.
I already make a tons of awesome Ruby on Rails list here;
https://github.com/asyraffff/Open-Source-Ruby-and-Rails-Apps
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.