Another option are some of the tools available in the open source Argyll CMS
. The drawback is that the interface is command line based.
iccgamut - Generate a plot of a ICC profile
tiffgamut - Generate a plot of the color space from a TIFF file
viewgam - To view the gamut plots
There is the option to use different rendering intents
To view the 3D graphs you need a plugin for your browser like the Cortona 3D
viewer (It's free for personal or non commercial use)