Download of Velocitypainting 0.5.4 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The latest installation package that can be downloaded is 11.6 MB in size. The software lies within Design & Photo Tools, more precisely 3D Modeling. We recommend checking the downloaded files with any free antivirus. The actual developer of this free software for Mac is Mark Wheadon.
From the developer:
Velocitypainting allows you to add patterns to your 3D prints without the need to edit the model, use multiple extruders, or swap filament. Acts as a front-end for a velocity painting script and makes life easier for macOS users. The actual script that does the job of converting your GCODE into velocity painted GCODE is written in perl.
You may want to check out more software for Mac, such as 3D Invigorator PS, Microspot Interiors Pro or Opera SVG Viewer, which might be related to Velocitypainting.