UPDATE: This repository is no longer maintained.
As of July 16th 2014, this Inkscape extension has moved to my Inkscape guide tools, which bundles it with other guide extensions. In that bundle, Grid Maker has been renamed to Add Grid Guides. Check out the new version here.
Inkscape grid maker
This Inkscape extension will generate guides in a grid of equal width columns (or rows) and gutters.
Licence of the plugin : GPL v2, just like Inkscape
Author: Samuel Dellicour