The public CGAL repository, see the README below

Interactive Jupyter widgets to visualize images, point sets, and meshes in 2D and 3D

A prototyped framework for deforming meshes in the editor and at runtime in Unity. Not in development anymore, but it's still pretty awesome!

FOLD file format for origami models, crease patterns, etc.

CLI and C library for processing triangulated solid meshes

2D-Finite Element Analysis with Python

parallel finite element unstructured meshes

2D Game Engine with visual WYSIWYG editor

A list of resources about deep learning solutions on 3D shape processing

A javascript implementation of the Catmull-Clark subdivision surface algorithm

Fast native STL viewer

Fully-Convolutional Point Networks for Large-Scale Point Clouds

A fast two-dimensional triangular mesh generator with pre- and post-processing utilities written in pure MATLAB (no toolboxes required, some support for Octave) designed specifically to build models that solve shallow-water equations or wave equations in a coastal environment (ADCIRC, WaveWatch3, SWAN, SCHISM, Telemac, etc.).

Open source library for scientific HPC

Yet another FBX exporter with flatbuffers serialization, goes with the Viewer (https://github.com/VladSerhiienko/Viewer, WIP).

A new boolean operations filter for VTK

Modified version of non-rigid Iterative closest point algorithm for fitting to noisy point clouds

Skeleton extraction from meshes.

A general purpose game engine for Linux, Android and the SEGA Dreamcast!

A library providing functionality for the geometric processing of polygonal(non-triangular) meshes.

A component to procedurally generate pipe-like meshes in Unity

Python 3 library for Neuron Analysis and Visualization

A much faster implementation of combining skinned meshes without messing with skinned mesh prefabs

Open Source road mesh generator script for Unity

A collection of common mesh subdivision algorithms

A c++ voxel engine module for godot.

A C++ geometry processing library

Plugin script to export Collada DAE files from Blender.