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Lila
Discontinued ♞ lichess.org: the forever free, adless and open source chess server ♞ [Moved to: https://github.com/lichess-org/lila] (by ornicar)
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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.
The website is fully open-source at github.com/wborgeaud/blindfolded-puzzles, so contributions and feedback are welcome!
Shout-outs to u/HariGeri69 and their post for giving me the idea and to lichess.org for their impressive collection of free puzzles!
NOTE:
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Hence, a higher number means a more popular project.