Display, convert, and edit raster image and vector image files
medical image conversion utility
Extend abcm2ps to support direct generation of PNG, SVG and PDF files
Open Source Solid Modeling CAD
Create PDF from JPEG scans and photos
Convert JASC pal files to png.
Embedded JPEG encoder
The Utah Raster Toolkit 3.0, patchlevel 2
Universal graphics translator
angif fork with transparency layers (proof of concept implementation)
A cross platform utility for packing images onto a single sprite sheet