List of video game middleware
Middleware for games is a piece of software that is integrated into a game engine to handle some specialized aspect of it, such as physics, graphics or networking. == Notable == Autodesk Gameware - from Autodesk, includes Scaleform GFx, Kynapse, Beast and HumanIK. Nvidia GameWorks - visual FX, physics, particle and fluid simulations.
Source: Wikipedia — List of video game middleware (CC BY-SA 4.0)