I use emacs for development, and it should work on Solaris as well. If you need a GUI debugger, you could try the Perl/Tk debugger. This would require that you install Perl/Tk, though.

>perl -d:ptkdb hello_world.pl
[download]

Update: the Tk debugger should be installed when you install Tk, but just in case, you can find it here. There's also the node Perl IDEs and Editors update.