Free software by Du!!

shalbum
Bourne shell script to create an HTML album from the image files in current directory. Highly configurable and very stable, although documentation is still poor. Customization can be achieved by changing variables in the script itself. Req ImageMagick.

stegotools
stegotools is a suite of UNIX command-line applications to read/write hidden information from/in files using steganography. It currently fully supports 24bpp bitmap images.