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Panda3D
Powerful, mature open-source cross-platform game engine for Python and C++, developed by Disney and CMU
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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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RakNet
Discontinued RakNet is a cross platform, open source, C++ networking engine for game programmers.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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bgfx
Cross-platform, graphics API agnostic, "Bring Your Own Engine/Framework" style rendering library.
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Bullet
Bullet Physics SDK: real-time collision detection and multi-physics simulation for VR, games, visual effects, robotics, machine learning etc.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
Panda3D
openscenegraph (mainly focuses on graphics, used by openmw for example)
pygame_sdl2 (SDL bindings for python)
And of course there are the non-free engines that support linux like unity3d or unreal
RakNet (UDP network library)
Torque
godot
If we're going to list graphics libraries then bgfx and irrlicht are probably worth a mention as well.
I also didn't see the very excellent C library raylib (well, really it's a collection) in the list.
GLM and CGLM should probably be mentioned as well since you'll probably want a good linear algebra library if you are going with just a rendering library instead of a full game engine.
As for physics there's tons of options, but the list gets rather exhaustive when considering 2D and 3D but you have box2d, bullet, and many many more.
GLM and CGLM should probably be mentioned as well since you'll probably want a good linear algebra library if you are going with just a rendering library instead of a full game engine.
As for physics there's tons of options, but the list gets rather exhaustive when considering 2D and 3D but you have box2d, bullet, and many many more.