Qzip 3d tool 
IMplementation of "Q-zip: Singularity Editing Primitive for Quad Meshes", Feng/Tong/Desbrun, ACM SIGGRAPH Asia 2021
Under GPL v3 license; contact mathieu.desbrun@inria.fr for info

Dependencies:

Eigen 3.3.4
Boost 1.69
Qt 5.11
CGAL 4.14
Freeglut 3.0.0
Glew 2.1.0
QGLViewer 2.7.2

Compiles with both VS2017 and VS2019