According to this blog post, Crytek has released CRYENGINE 5.3 today with NVIDIA’s PhysX built-in as an alternative to the company's proprietary CryPhysics. Hit the link for full release notes and a link to download CRYENGINE 5.3 for free. NVIDIA’s PhysX technology is coming to CRYENGINE in the 5.3 release as a beta, making it the first time that users will have a built-in alternative to our proprietary CryPhysics suite available to use when building their games. This will give all Cryengineers more flexibility than ever before when it comes to selecting the right physics solution for their games’ unique needs. For those unfamiliar with it, NVIDIA PhysX is a scalable multi-platform game physics solution supporting a wide range of devices that has been used in many of today’s most popular games and platform.