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Theory-based: Codecademy Project-based: Hyperskill Challenge-based: LeetCode, Codewars
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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LeetCode
Discontinued This is my LeetCode solutions for all 2000+ problems, mainly written in C++ or Python. (by lyhsieh)
Theory-based: Codecademy Project-based: Hyperskill Challenge-based: LeetCode, Codewars
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adventofcode
Advent of Code solutions of 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023 and 2024 in Scala (by sim642)
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.