NVIDIA Corporation has announced the availability of the PhysX SDK 4.0 to be released on December 20th, 2018. Furthermore, they have announced that it will be open source starting from version 3.40 under the BSD license.
PhysX is a physics engine which provides industrial-grade simulation quality at game simulation performance.
Aside from that, the SDK comes with an array of new features with stability improvements around coordinate articulations and joint improvements.
There are also new filtering rules for kinematics and statics which brings increased scalability. Cmake projects are now supported.
For now, you can download the latest copy of PhysX SDK 3.4 from GitHub.