ManOpen

ManOpen is a utility to view Unix manuals in a graphical environment instead of a terminal emulator such as Terminal. Included with the application is a command line utility called that will open invoked man pages in ManOpen. Internally ManOpen does not directly view the man page but runs it though Harald Schlangmann's cat2html or cat2rtf into HTML or RTF for viewing.
ManOpen is based on a NeXTSTEP utility of the same name and by the same author.