The public CGAL repository, see the README below

Mathematics library focused on geometry for Multiplatform Kotlin 1.3

Fast, header-only polygon triangulation

2D Geometry for Unity. Suited for everyday polygon hassle. Polygon clipping, polygon winding direction, polygon area, polygon centroid, centroid of multiple polygons, line intersection, point-line distance, segment intersection, polygon-point containment, polygon triangulation, polygon Voronoi diagram, polygon offset, polygon outline, polygon buffer, polygon union, polygon substraction, polygon boolean operations, and more. It is a polygon fest.

Unity3D: A set of helper classes for 2D geometric calculations.

Open-source C++ library for geometry and linear algebra

Geo-Toolkit for PHP.

Programming Contest Book.

Scientific Python Geometric Algorithms Library

C++ library and set of utilities for input, output, and basic manipulation of 3D triangle meshes

A web-based 4D Geometry viewer

MATLAB Toolbox for Handling 2D and 3D FEM Meshes

🎨 | maptalks plot

The course notes for Stanford's CS231A course on computer vision

Create parametric 3D fusion reactor CAD models

A geometry library written in Python

Ifc viewer for client applications.

A spider tapestry weaver

Building hitboxes has never been easier

Delaunay and Constrained Delaunay Triangulations in Java, providing high-performance utilities for modeling surfaces with support for Lidar LAS files, Digital Elevation Models (DEM), finite element analysis, path planning, natural neighbor interpolation, and other applications of Triangulated Irregular Networks (TIN)