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Briefly, fig2MF uses the mfpic macros to create formatted, commented MF code from the fig graphics language. This means that programs like xfig can be used as interactive font creation tools. I wrote fig2MF so that I could portably illustrate TeX documents, but I suppose one could use it to design letterforms as well.
The package consists of a single C source code file, modified mfpic macros, documentation, and sample fig files. It is available at the shsu archives.