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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.
While the actual graphics content is way out of date due to the site closing down, this set of tutorials is what saved me when I needed to self-learn game programming during university: https://github.com/gametutorials/tutorials . If you're already comfortable with C++ then maybe don't bother, but otherwise it's a good starting place before you get into the details of the GPU stuff (do not subject yourself to learning D3D 9).
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Hence, a higher number means a more popular project.