Have you looked at
Geany? The link will take you to the "About" page, and it says it works on MacOS X, but I have no idea what the differences are between OS X and Lion. Not a "Mac guy".
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Ahhhh, the vagueries of the aging mind. Wait.... What was I saying?
Carbonite <----- GitHub main module (Maps ONLY) download link. The other modules are also available on GitHub.
Carbonite-CLASSIC<----- GitHub link to Carbonite Classic. Thanks to ircdirk for this!