Drawing, graphics conversion, software development, administration.
Swiss army knife of image processing
Tools to process and visualize scientific data and images
Open Source Solid Modeling CAD
Easy-to-use command line tool for images
Various small and useful command-line utilities
Free professional video converter Windows|Mac|Linux
Command line tool for scaling and denoising images
Create neat .HTML galleries from your photos
Complete solution for HDR photography
Image Viewer and Graphic Manipulation Tool
From Inkscape SVG files to HTML image map or coordinate list
Convert images to Ascii Art, with a lot of options and drawing tools
smart tool for converting imageformats on command-line
Mesh and point cloud processing tools
angif fork with transparency layers (proof of concept implementation)
Gimpel3D - 2D/3D Stereo Conversion Editor
Not your usual Architectural Modeler