Bullet Physics SDK: real-time collision detection and multi-physics simulation for VR, games, visual effects, robotics, machine learning etc.

PositionBasedDynamics is a library for the physically-based simulation of rigid bodies, deformable solids and fluids.

B2 makes it easy to build C++ projects, everywhere.

A small and efficient C++ JSON library (for both read/write)

C++ bindings for libxlsxwriter.