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LearnOpenGL
Code repository of all OpenGL chapters from the book and its accompanying website https://learnopengl.com
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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.
SFML would also be an option. It uses C++ functions like namespaces and does not rely on manual pointer management like SDL. It is also much easier to learn and also supports audio etc. out of the box. Here is the link to the official website if you want to try it out: https://www.sfml-dev.org
I would recommend taking a look at Dear ImGui with either the SDL or GLFW and OpenGL backends to start with (see the examples).
NOTE:
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Hence, a higher number means a more popular project.