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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.
https://perl6book.com has server books for Raku.
Raku has a lot of syntax. My first attempt at learning the language failed because I couldn't get past all the strange syntax I saw at https://docs.raku.org/. Sometimes I didn't know what the syntax was called, so I didn't know what to search for.
There are a variety of predefined exercisies in Exercism that have yet to be implemented in Raku: https://github.com/exercism/problem-specifications/tree/main/exercises
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.