This and related questions are asked quite often. Use Super Search with terms like; HTML::Mason, embedded perl, templating, large CGI applications, MVC, etc.
Perrin has a good templating system comparison article on perl.com.
In reply to Re: newbie question: Mason, CGI::App, MVC
by Arguile
in thread newbie question: Mason, CGI::App, MVC
by nop
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