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I know the P5 Getting Started guide says "You can use the code editor of your choice"; but given the wide range of free and Open Source editors available it was a little surprising to see Sublime Text (ST) used as the example editor. This isn't a criticism of ST: it's without doubt a fantastic editing environment and very widely used in web development; but it costs money and the linked page on Wikipedia misses a number of really good, free alternatives. So to redress the balance I thought I'd include a couple of options here:
Brackets This looks like a really good choice for beginners; and it's free. The interface is simpler than ST and the built-in live preview is a fantastic feature (though is limited to Chrome): save your JS file and the browser automatically reloads. Yes you can do that with ST and other editors; but in Brackets the button's there from the get-go.
Atom I haven't had a chance to try this out yet; but this could take ST's crown as the goto tool for web dev and again it's free and backed by Github...
Lime Text Editor So new you're going to have to compile it from source; so not one for the newbies. Only just heard about this but will be giving it try.