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adventofcode
Advent of Code solutions of 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022 and 2023 in Scala (by sim642)
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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.
Oh, regarding finding more diverse problems, I just remembered a site I spent some time on a few years ago: www.codewars.com
Another one I've poked at in recent years is Advent of Code where once a year during the months of december, you get one problem a day until Christmas. It's been running for 7 years and you can still go solve the older problems.
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.