Source : Free On-Line Dictionary of Computing

toolsmith
     
        The software equivalent of a tool-and-die specialist; one who
        specialises in making the {tool}s with which other programmers
        create applications.  Many hackers consider this more fun than
        applications per se; to understand why, see {uninteresting}.
        Jon Bentley, in the "Bumper-Sticker Computer Science" chapter
        of his book "More Programming Pearls", quotes Dick Sites from
        DEC as saying "I'd rather write programs to write programs
        than write programs".
     
        [{Jargon File}]