is a basic, light-weight text editor for Mac: it has almost all the base functions you would expect from an editor like TextEdit. Indeed you'll find it has fewer functions than TextEdit because it is designed to work only with text in the simplest way: starting from a blank window you can do practically anything with your characters. As it is a pure text editor it doesn't work with images or photos you'd like to put in your text. It does open Rich Text Format files (.rtf) and Unicode-formatted Plain Text files (.txt): it saves both as .rtf and exports as Plain text.
Note for Mac OS X 10.5 users: although there is a Universal version of this app (see above), it has not been tested carefully on Leopard, and thus it could run with some issues.
To read about Known Issues, go to this page