Introducing the Spline Brush Tool version 1.00 - a powerful tool for Autodesk 3ds Max that transforms the way artists create and manipulate splines in the 3D world. Designed for intuitive use, this tool allows you to edit and refine splines directly within your viewport, streamlining your workflow and enhancing creative control.
Also this tool is a very nice addition for the Hair Cards tool: https://citizenwolf.gumroad.com/l/haircardtool2

The tool doesn't have a trial version and it has a cloud license type. After purchasing please read the  and README file to understand how to get the license key! Additionally, the tool requires an active internet connection to function properly.
You can transfer the license key to another computer whenever needed by activating or deactivating it. However, the license is valid only on the computer where the key is currently activated!

Interactive Spline Brush: Brush splines directly in the viewport with brush-like strokes, offering a natural and intuitive creation process.
Real-Time Editing: Modify spline points and curves on-the-fly, enabling immediate adjustments and refinements without disrupting your workflow.
Customizable Brush Settings: Adjust brush size and strength to suit your specific project