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FWIW, you can try using pfaedit for free on Mac OS X. (It makes Unicode/OTF files among others. Load a Type 1 font and Save As an OTF. A simple conversion.)
Goto Source Forge to download and install XonX. http://sourceforge.net/projects/xonx/
Download pfaedit and unpack. http://pfaedit.sourceforge.net/index.html
Drag the pfaedit directory to the Applications directory.
Start XDarwin (XonX).
In an X terminal window (not an OS X terminal window) type pfaedit and you're in business.
pfaedit seems very solid, but the Aqua-XonX combo is rather tetchy.
OroborOSX makes a nice window manager to go with X Darwin: http://oroborosx.sourceforge.net/
pfaedit is basically a Unix/Linux X11 app, but there is also a cygwin version that can be used under Windows. Installation instructions for both Mac OS X and Windows are available on the pfaedit home page: