Plater: plate generator and optimizer
Plater
https://www.youtube.com/watch?v=WTK5fVQNPsI
Plater is an open-source 3D printer plates placer and optimizer. It takes a few STL files and some parameters such as the plate dimension, part orientation and spacing, and it tries to generates 3D model(s) to print your parts with at least as possible plates.
It uses a really simple configuration file (plater.conf) that contains the list of parts with their quantities and dimension. You can then build your STL plate(s) and release it with your part, or simply release the plater.conf file and let people do their own plates using their own settings.