(X)Emacs does all that you have listed.
With CPerl-mode + auto-fill + etags, I can have all the thingummagic provided by shiny IDE's. Probably these links will help you the most:
Also these two directives will help you index and navigate the source code from the menu:
(add-hook 'cperl-mode-hook (function (lambda () (imenu-add-menubar-index))))
(add-hook 'cperl-mode-hook (function (lambda () (imenu-add-to-menubar 'Func))))
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