I'm a big fan of Coda for the actual IDE. Well, more of a text editor, similar to TextWrangler. Not free, but it has the built in SFTP client, so it covers th

I'm a big fan of Coda for the actual IDE. Well, more of a text editor, similar to TextWrangler. Not free, but it has the built in SFTP client, so it covers that. Also suggest balsamiq as an alternative to omnigraffle; both are excellent products. Might want to try balsamiq (free for a month) just so you know what else is out there.