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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've been building a road map of sorts, including paid and free resources. It might be useful to you: https://github.com/fpsvogel/learn-ruby. It has lots on Rails, as well as general dev skills and a few specialized topics.
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.