Read, write and edit metadata
Draw vector graphics to scale using a descriptive language
JaxoDraw: Feynman Diagrams made easy!
Bar Code (1D or 2D) generator in pure Ada
2D CAD for precise drawing
BRIC is a powerful tool for batch image processing.
Jade is a cross-platform diagram editor built on the Qt framework.
Create and edit SVG graphics directly in ownCloud. Based on svg-edit.