buckshot is a free to use, open-source image conversion utility for Windows, Mac OSX and Linux. It is based on a command-line image conversion tool called "bmp2dhr".
It's mostly a toy to play around with, as it doesn't support all features available in bmp2dhr, but it works well and is fun for checking out possible conversions.
While much work has been done, this is my first attempt to deploy a desktop application written in Qt. If you have problems, please report them on the project issues page.
Use the "Around the Web" links below to find me. It shouldn't be too hard. ;)