Open Source Solid Modeling CAD
BRL-CAD is a powerful cross-platform constructive solid geometry solid modeling system that includes an interactive geometry editor, ray-tracing for rendering & geometric analyses, network distributed framebuffer support, image & signal-processing tools.
The Cross-stitch WorkShop is a Qt-based GUI application for converting arbitrary images into printable cross-stitch patterns.
A simple image browsing application for Mac OS X, inspired by the early versions of ACDSee. The focus lies on viewing photos and other images rather than editing. Kinda like ChiperSoft's Simple Image Browser on steroids.
Machine embroidery software to design, scale, and transform embroidery files for various formats.