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).
VMF Exporter
The Wall Worm tools allows you to send your 3ds Max scene to Hammer and Source via a VMF Exporter.
MDL File Loader
Geometry Plugin to load Valve's MDL files directly into 3ds Max.
Visgroup Manager
The Visgroup Manager in Wall Worm allows you to arbitrarily show/hide objects in your scene.
Mass Model Fetch
The Mass Model Fetch Utility allows you to import multiple props into your scene at once.
Overview Exporter
The Overview/Radar texture exporter allows you to export an overview texture straight from your Max scene.
Export Textures to WAD
Export Bitmaps from your 3ds Max scene to WAD files.
Random Elements
Random Elements Modifier lets you randomize position, rotation and scale of geometry or UVs at the element level.