The LightWave Assets / Plugins database maintains a list of free and commercial third-party plugins available for LightWave.
The LightForge Render Network for LightWave3D
Channel Modifier that gets its data from the Global Ambient Intensity
A collection of new light types
Analyzes an HDR image and creates a light rig that matches
Allows you to easily setup multiple render passes
Image based lighting preset and configuration system