Ink/Stitch - An Inkscape extension for designing machine embroidery patterns.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Crosti - make your own unique cross stitch design from custom image
FreeCAD - An open-source parametric 3D modeler
Wilcom TrueSizer - Based on the same core software as Wilcom’s acclaimed professional embroidery design software, .
MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming