The public CGAL repository, see the README below
Fast Portable Noise Library - C# C++ C Java HLSL GLSL JavaScript Rust Go
The JTS Topology Suite is a Java library for creating and manipulating vector geometry.
WAS-NS v3 Reborn; Tools for image processing, filters, masking, text, logic, numbers, latents, files, 3D scenes, and animation.
The missing pieces for Unreal's PCG. Graph theory, advanced pathfinding, spatial ops, filtering, asset management, and more.