Free HL Iconlib
   A free and opensource Java library for extracting icons and GIF-images from the hotline.dat file of the Hotline software provided by Hotsprings, Inc.
   http://www.markusstengel.de/hliclib.html

Net-Hotline
   A set of modules for utilizing the Hotline protocol in a Perl environment.
   http://search.cpan.org/dist/Net-Hotline/