Sky Writer
Sky writer allows you to render your 3ds Max scene straight into the Source Game Engine as a HDR 2D sky texture (also known as a cubemap).
Exporting Correct Smoothing on Models
Understanding Smoothing Groups and Explicit Normals
Discussion on smoothing groups and explicit normals and how they relate to Source.
Animated Textures
Instructions on creating an animated texture in 3ds Max and exporting to Source.
Detailer
Bringing life to your scenes
Detailer is a detail sprite primitive plugin with exporters. The tools allow you to either create VBSP files, and will also create geometry that exports into the Source Game Engine with the Wall Worm VMF exporter.
Convert Scene to Model
Instructions on converting a scene into a model or clustering multiple model props into single models.
Wall Worm Anvil
Formerly called Wall Worm Displacement Tool
Overview of Anvil. Anvil is a level design toolset to help send 3ds Max scenes into Source.
Arch Primitive
The Arch Primitive is a scripted geometry plugin for 3ds Max that creates arches for world geometry in BSP games such as those made on the Source Engine
Wall Worm Model Tools
Wall Worm Model Tools is a collection of tools for getting your models and textures from 3ds Max into the Source Game Engine.