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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.
Things have changed since then (rapid time control hadn't even been introduced yet) and I wanted to update the work he did. So I downloaded the public profile information for about a million lichess.org accounts, out of which about 28,000 had self reported FIDE ratings, and generated linear and multiple linear regression models for every combination of the four ratings (bullet, blitz, rapid, classical) for a total of 15 models.
Here are the links to the website and the source code for the site.