iToo Forest Pack 6 + RailClone 4 are plugins for 3ds Max.
Forest Pack is designed to give a complete solution for the creation of vast surfaces of trees and plants.
The fully integrated solution uses a familiar UI and workflow to create almost unlimited geometry with complete control over every detail. That's not all, use Forest Maps to randomize maps and add tints, quickly populate a scene using our included library presets or create your own, and use Forest Tools to convert scatters to max instances or XML data for use in large pipelines. With its power, unrivaled features list, ease-of-use, and premium support Forest Pack will change the way you render.
RailClone is a plugin for parametric modeling based on custom geometry parts, definable by the user, and a set of construction rules. With RailClone you can build complex and realistic structures for Architectural Visualization, Civil Engineering, Industrial and Interior Design.
With RailClone you may create all kinds of parametric objects. Fences, railings, walls, bridges, stairs, floors is only a small set of what can be done. The software includes a full library of predefined styles, but it is not limited to a fixed set of primitives, you can use any geometry from the scene and define your own parametric models.