TextWrangler

TextWrangler is the best free GUI text editor I’ve ever used and certainly worthy of being the progeny of the almighty BBEdit. I can’t say that there’s anything I haven’t been able to accomplish with it, either through native features or some AppleScript voodoo. I use it for everything — the code that runs this site, the posts you see on this site, law school, side projects, personal notes, Mac OS X config files, etc — I currently have 17 open documents in my TextWrangler drawer. It’s great.