FilePizza - Open source application used to transfer file via WebRTC and WebTorrent.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Bashupload - Upload files from command line to share between servers
FreeCAD - An open-source parametric 3D modeler
transfer.sh - Easy file sharing from the command line
Inventor - Inventor is a 3D CAD software that lets you quickly create 3D models with embedded intelligence, intuitive workflows, and optimized performance.