Visgroup Manager
The Visgroup Manager in Wall Worm allows you to arbitrarily show/hide objects in your scene.
Studiomdl.exe - SteamStartup() failed
You'll get this studiomdl error if you try to compile a model and Steam isn't running.
Attachments & Particle System UI
Attachments are points on your model where you can attach extra models and particle systems (guns, sprites, etc). This page details both Attachments and Particle Systems since the Particle System controls are also in the attachment rollout.
Porting Levels into Source
General Overview of Converting Scenes that Were Not Designed with Source in Mind
Overview on porting scenes and levels from other sources.
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).
Material Library Generator
Explanation of how to use the Material Library Generator.
Making Facial Animations
This page explains how to export your facial animations into Source. Facial animations are done using a different procedure than most animations in Source.
VMF Exporter
The Wall Worm tools allows you to send your 3ds Max scene to Hammer and Source via a VMF Exporter.
Normal Tools
Normal Tools are a collection of utilities and functions for quickly editing your Normals in 3ds Max.