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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.
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ODE
Open Dynamics Engine (ODE) github mirror from https://bitbucket.org/odedevs/ode (by thomasmarsh)
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OpenFrameworks
openFrameworks is a community-developed cross platform toolkit for creative coding in C++.
Forget the idea to create a custom game engine. Start by learning how to create a game instead and the engine will get a shape at some point. You should give learnopengl a shot. It will teach you some fundamentals for getting a basic window with a triangle up 'n running and in time you'll connect the dots and learn how to render sprites, fonts, models and what not.
Like this place.
You could look at Coin3D : https://github.com/coin3d/coin
Godot Is another good one, a fully FOSS engine. Maybe even get involved with the community and help with simple tasks or debugging or documentation.
q.v. https://openframeworks.cc/