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Exercism - Scala Exercises
Crowd-sourced code mentorship. Practice having thoughtful conversations about code.
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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'm learning it as we speak, and I have found that exercism.io is a valuable tool. Not only because of the number of exercises available, but also because you can get mentor feedback. It was valuable when I started out, and is something I come back to when I want to learn best practices.
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.