For fast conversion, you can also use a command line tool called otf2bdf. The homepage is here: http://sofia.nmsu.edu/~mleisher/Software/otf2bdf/

Linux users can install it with something like apt-get install otf2bdf.

Here is a pre-compiled version of otf2bdf but for Mac Users

Use it in a terminal by calling it like:

otf2bdf FontFile.ttf -p pointsize -o FontFile.bdf

For example here is how to convert a font to a 12 point BDF file:

otf2bdf ChicagoFLF.ttf -p 12 -o Chicago-12.bdf