Long story short, I was sick of writing man pages in an endless cycle of edit-view, edit-view so I decided to do something about it and made this editor. It's a bit rough around the edges, but it works really well for me. Maybe it will also be of some use to you.
To learn more about the Mac OS X man page format, run the following command:
or, alternately, read this page.
You can download a pre-built binary of version 3.1 here:
The ManDrake source code is distributed under a BSD license and is available on GitHub