The LightWave Assets / Plugins database maintains a list of free and commercial third-party plugins available for LightWave.
Straighten rectangular UV selection
Versatile state of the art fluid simulation
Colorida is a free non-destructive interactive cloning plugin.
Remesh complex models with good polyflow, quads and guides.
Render very large images without running low on memory
Allows previous versions of LightWave to load object files from LW2018
Global, shared node graphs.
Load and save OpenEXR format images
Image sequence editor and custom image loader
The OD Toolset is a combination of Layout and Modeler enhancements
A collection of different plugins