I've written ones for work, but only internal tools. They work well though. I also wrote a few you can download on my website. I compiled win32 binaries for them, but the scripts are also included (they may require a few tweaks to run, but nothing major. The scripts were written for perl2exe and may have a few hard coded paths that perl2exe needed to compile).

All of my perl GUI apps are written using Tk. I've recently had some problems running Tk at all on OSX.

Two Perl/Tk GUI apps I wrote:
Bugfight : A simple evolution simulator
Spew : A tetris clone where the board spins around and zooms in and out.

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