StackBuidler 3.3 could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The actual developer of the free software is treeDim. We recommend checking the downloaded files with any free antivirus.
From the developer:
StackBuilder is a simple palletization tool that can be used for optimizing the arrangement of packages on transport structures and has the mission to reduce the costs of product shipment.
A project can include boxes, cases, bundles, cylinders, inter-layers, all of different dimensions (length, width, height, thickness) and weight. There are various parameter customization options specific to each item.