Source : Free On-Line Dictionary of Computing

Mops
     
        Like {Yerk}, Mops is descended from the ex-commercial
        {object-oriented} language {Neon}.  It was developed by
        Michael Hore .  Mops features an
        optimising {native}-code compiler; it is much faster than
        Yerk, but less compatible with Neon.  Mops includes extensions
        such as {multiple inheritance}.
     
        Version 2.3.1 includes a compiler, documentation and an
        editor.
     
        A {Macintosh} version is available.
        {(ftp://oddjob.uchicago.edu/pub/Yerk)}.