As a writer, I need ready access to a range of text functions, and I need them in whatever application in which I happen to be writing. In most of the rich text editors I use, those functions are available somewhere in the app's menus, but typically they're in different places within each app. Some apps don't include one or two key functions at all.
Mac OS X has a rich text framework that provides just the set of editing tools I require, and it would be extremely handy to be able to access those tools consistently across apps. This is precisely what the MarsThemes Text Tools do: Grant easy access to the key Cocoa text tools that writers and editors need but can't find.