Physics Engines

Box2D

erincatto/box2d

Popular

The classic 2D physics engine; the v3 rewrite brings large performance and stability gains.

Jolt Physics

jrouwe/JoltPhysics

Trending

Multithreaded rigid-body engine from Horizon Forbidden West, now built into Godot.

PhysX

NVIDIA-Omniverse/PhysX

Popular

NVIDIA's open-source real-time physics SDK with GPU acceleration, used in many engines and AAA titles.

Rapier

dimforge/rapier

Rising

Fast 2D/3D physics engine in Rust with optional determinism and JavaScript/WASM bindings.

Avian

avianphysics/avian

Trending (detected automatically)

ECS-driven 2D/3D physics engine for Bevy, formerly known as bevy_xpbd.

Bullet

bulletphysics/bullet3

Legacy

Long-standing open-source physics SDK for games, robotics and VFX, now with little active development.

Matter.js

liabru/matter-js

Popular JavaScript 2D rigid-body physics engine for the web.

cannon-es

pmndrs/cannon-es

Legacy

Maintained fork of cannon.js, a lightweight 3D web physics engine often paired with Three.js; low activity.