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Perl Programming/GUI programming
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Perl Structure and style CPAN
GUI and desktop programming
There are several GUI widget sets available as additions to Perl, though the most common is probably Perl/Tk.
Gtk uses Gtk+, the Gimp Toolkit.
Gtk2 uses Gtk+ 2.x.
Gtk3 uses Gtk+ 3.x.
Prima uses its own toolkit.
Perl Tk (sometimes pTk or ptk) is a collection of modules and code that attempts to wed the simple Tk widget set to perl 5.
Tcl::Tk same as perlTk, but uses existing Tcl/Tk via Tcl, so allowing Tcl widgets
Tkx a different, lightweight, access to Tk via Tcl.
Qt uses the Qt toolkit.
Wx uses the platform independent wxWidgets toolkit.
Links
The comp.lang.perl.tk FAQ
Perl Structure and style CPAN