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LeetCode
Discontinued This is my LeetCode solutions for all 2000+ problems, mainly written in C++ or Python. (by lyhsieh)
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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 fairly new to C# myself so I have no advice on projects, but you can always move up to the "professional" problem site and start tackling leetcode problems. This has the advantage of being a tool that some companies actually use for hiring and testing, so if you're interested in solving problems, you might as well do it somewhere that you might get credit for it.
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.