Havok Physics, better known as simply Havok, is a middleware physics engine developed by Irish company Havok. It is designed for computer and video games by allowing interaction between objects or other characters in real-time. By using dynamical simulation, Havok allows for more lifelike worlds and animation, such as ragdoll physics. The company has also released a Havok Animation and Havok FX, which uses Shader Model 3.0 on consumer GPUs for effects physics such as smoke.

Euphoria is a game animation engine created by NaturalMotion based on Dynamic Motion Synthesis, NaturalMotion’s proprietary technology for animating 3D characters on-the-fly “based on a full simulation of the 3D character, including body, muscles and motor nervous system”. Instead of using canned animations, the characters’ actions and reactions are synthesized in real-time, and so are different every time even when replaying the same scene. Euphoria runs on the Playstation 3, Xbox 360 and PC platforms.