FumeFX is a fluid dynamics engine designed for simulation and rendering of realistic fire, smoke, explosion and other gaseous phenomena.
It’s versatility, robustness and intuitive workflow makes it a perfect solution for the most demanding tasks in the computer graphics industry. Almost every aspect of simulation can be customized through 3ds max scripting, allowing user to interfere with simulation computation at the lowest level.
AfterBurn is a production-proven volumetric effects plugin that has been used in cinematic productions such as Matrix Reloaded, Armageddon, Dracula 2000, K-19: The Widowmaker, HBO trailer, Mechwarrior3 cine trailer, various IMAX movies and games such as Warcraft3, Starcraft, Sin and many others.

DreamScape is sophisticated set of 3DS MAX plug-ins for creating and rendering realistic landscapes, seascapes, skies, clouds, outdoor lighting and more. In contrast to other terrain creation tools for 3DS MAX, DreamScape Terra uses new rendering technologies that occupy much less of your computers memory (RAM) making it possible to render large detailed terrains on even a modest system. An intuitive and friendly user interface will allow you to easily tweak terrain properties, interactively paint elevation, and even to apply erosion effects.

Enlight is intended to fill the gap between standard MAX lights and physically based radiosity solutions. Flexible, user friendly and fast, it is fully MAX/VIZ 3.x compatible and uses the latest enhancements in the MAX software architecture.

ScatterVL Pro will let you alter any aspect of volumetric light, even to use own projector map! Included SVL Caustic Map plugin enables caustics inside the volume. Since this map is actually faking caustics effect, rendering times are pretty close as rendering with Shadow Maps.
For the most demanding tasks, built in finalRender suport will provide interface to the special effects such as raytraced caustics.