visprint (http://www.tastyrabbit.net/visprint/)
By Goizeder Ruiz de Gopegui
Copyright: Goizeder Ruiz de Gopegui
License: GPL
visprint is a program to produce visual fingerprints. This code was written by Ian Goldberg, based on an idea by Hal Finney, in a post to the coderpunks mailing list. The most excellent color enhancements were added by Raph Levien. David Johnston Ported the program to Windows 95 console mode and added a bunch of nice features. Soren Andersen developed the png and transparency code.
I decided to rescue the code from the oblivion of the internet, clean it up and maintain it. As far as I know, there is no copyright infrigement, since the code has always been free and available in the net and the previous authors are properly acknowledged. (Please, don't sue me ;)
Take a look at the man page for more information about visprint.