Orbaz released they free tools for Particle Flow for 3DsMax 2012. These tools called also freebies are available to all users for free download. A short description about the free tools you can read next in the article. If you want to know more go and visit Orbaz website located at the bottom of this article. The tool set includes:
Camera Culling Operator
Camera Culling can reduce the geometry load in the viewports and/or at render time by filtering out all particles not visible to the camera...
Camera IMBlur Operator
The Camera IMBlur operator is intended for use when rendering a particle system with motion blur as viewed from an animated camera...
Copy Out Test
The Copy Out test is a simplified version of the Spawn test that you can use to reduce overhead in the particle system when you simply want to duplicated particles without using other Spawn settings...
Display Script Operator
The Display Script operator is a diagnostic tool that lets you display viewport data associated with each particle...
Stop Operator
Normally in Particle Flow, when you want to stop particles, you need to add a Speed or Spin operator (or both) and then set their values to 0...
Stop Gradually Test
This test builds on the capabilities of the Stop operator, letting you stop particles gradually. You can set the time at which particles should begin slowing down, as well as the time at which they should come to a complete halt...
Source and full article: Orbaz