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projectbook
100+ project ideas with specifications, mock-ups, and assets for learning any programming language
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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.
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LeetCode
Discontinued This is my LeetCode solutions for all 2000+ problems, mainly written in C++ or Python. (by lyhsieh)
... leetcode ? I am surprised no one mentioned it yet, maybe it has such a bad reputation. But, it has tons of problems, lots of people solving them, and you can unlock answers (by paying a pretty hefty amount of real $$).
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.