The GUI Loft - A powerful and easy-to-use WYSIWYG design tool for designing Win32::GUI Windows. - http://user.bahnhof.se/~johanl/perl/Loft/
LAOLA - A collection of documentations and perl programs dealing with binary file formats of Windows program documents. - http://user.cs.tu-berlin.de/~schwartz/pmh/
dada's perl lab - Modules, scripts and CGIs for Win32, including Win32::Sound, Win32::API, Win32::Internet, Win32::Clipboard, Win32::Console, Win32::Shortcut and Win32::GUI. - http://dada.perl.it/