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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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SoftGLRender
Tiny C++ Software Renderer / Rasterizer, and implements OpenGL and Vulkan renderers for comparison
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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.
Other than that, I recommend also checking out learnopengl.com. It's one of the best beginner resources out there. I was able to teach myself all the graphics required to make this game in under a month.
This is a really good example of a software rasteriser which is a good project to try https://github.com/keith2018/SoftGLRender
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.