Diamond is a free rich text editor with a difference. Lots of differences, actually, which combine to make it quite appealing. Developer Geoffrey Alexander has recently released Diamond 3, which makes this an excellent time for you to download and give it a try.
How is Diamond different? Diamond windows look different. Sometimes they're hardly there. They may or may not have title bars. They may or may not hover above a background (flat color, or photographic, it's up to you) that in turn hovers over everything else on your desktop.
Text inside Diamond documents flows in columns. Word and character counts float unobtrusively below the windows, as if hanging in space. If you want them to. Aspects of Diamond's differentness are yours to tweak in the prefs, of course, so you can de-weird things if you feel the need. But that takes all the fun out of it.
If I'm not making much sense here, I encourage you to take a look at the Diamond gallery or download the app to try it for yourselves. As Geoffrey himself once said: "Diamond isn't for everyone, and may not even be for anyone." But I rather like it, if only because it takes the mundanity of editing text and adds a bit of life that you don't find in other rich text editors.