Just van Rossum collaborated with fellow Dutch typographer Erik van Blokland to fuse programming and letterform design in a hack to the PostScript programming language. The result was the FF Beowolf typeface, the first dynamically generated typeface, which modified letterforms on the fly. Using a randomizing algorithm to generate different letter forms each time a letter was printed. FF Beowolf laid the foundation for the FontFont library.
Van Rossum’s FF Justlefthand was (as part of the FF Hands package) the first digital handwriting font ever, which caused in a global geographic extension of the type family. He also worked with Erik Spiekermann in developing the ITC Officina typeface, containing a sans and slab serif version.