In Windows, I use Homesite, since I learned HTML before perl and Homesite is a terrific editor. It recognizes perl (via the filename's extention) and highlights accordingly.

For Linux, in a X environment, I like Glimmer the best so far.

http://glimmer.sourceforge.net/

The KDE advanced editor is also ok.

Cooledit is also another one worth looking at. I don't like it as much as Glimmer, but it shows promise.

http://cooledit.sourceforge.net/

Good luck -db