Music Hack Master Plan is a limiter plug-in that, in addition to the Brickwall limiter, offers a whole range of EQ, compressor and saturation functions to simplify mastering with just one plug-in. Stan Greene, his peer already nominated for the Grammy (he worked on tracks for Pharrell Williams or Busta Rhymes) and Sam Fischmann, the programmer, have teamed up to create a mastering plug-in that should also allow inexperienced users to deliver richly mastered mixes.
Music Hack Master Plan is a more than decent plug-in, the limiter is quite transparent and above all the stereo widening works without phase problems. You can use it not only as a mastering tool, but also as a quick test station to see what is wrong with a mix. Then you can start with other tools that perhaps go into more detail.