This is the updated extension for Inkscape which simulates 9 different types of vision. It's a color effect and therefore it can be found over at Effects->Color->Color Blindness after installation.
It still supports the same set of modes:
There is now also a gamma drop down list at the bottom of the dialog. I'm not really sure if Mac/X11 uses the same gamma as *nix (which uses the same gamma as Windows). If so this box could be probably dropped.
As usual all kinds of comments are welcome. If there are no issues, it will be added to Inkscape soonish.