The GRAPE PyMOL plugin can be downloaded at
Installation directions and other documentation can be found at:
It is important to note that this plugin requires PyOpenGL and a recent version to be installed into the PyMOL installation. The documentation touches on how to do this but it can be somewhat difficult. In order for this to really be easy to use, Schrödinger will need to update PyMOL to include a more recent version of PyOpenGL.