Try the free Komodo Edit. It's a really excellent Perl IDE with realtime syntax checking, fast and rich interface, hundreds of options, very pleasant colors, snippets, templates, completion, tidy, reliable backups, perfect restorations, support for about a hundred other languages, and lots more.
One of my favorite features: A few seconds after making a typo or other mistake the lines that will be broken by it are underlined in red, and will popup the warning text on mouseover.
https://www.activestate.com/products/komodo-ide/downloads/edit/