WEBCHICK  Not every program can be written to fulfill everyone's needs and skill sets. This is a venerable set of (mostly) command-line tools that will find the most use by developers, particularly those who work in a multi-platform environment. Its strengths lie primarily in the usefulness of these tools in scripts: whether it be processing one image on-the-fly or batch processing thousands of images. There are plenty of fine freeware GUI image processing applications out there, so if you're not looking for command-line image processing tools geared for developers, move along and no whining.  
(Version 6.4.8)