One of the few native Mac code-editors. Has a gorgeous innovative UI and is an absolute joy to use. Comes with a very nice CSS editor with Xray mode to preview and debug your CSS stuff. Also: a host of other features that need a website to be shown. About the only thing missing is an impressive list of plugins and extensions that some of the other editors have. But they're working on that. Note: v3 used to be. It's v5 right now, as the numbering scheme has been changed to 'Sketch format'.