Volumouse has a plugin that allows the user to scroll on top of the title bar of an active window and hence resize it. While not the same as gridmove, which is meant to move windows to specific grids, it offers a common end benefit - being able to resize windows quickly. Unlike gridmove, which uses pre-defined window sizes, this can resize to any dimension in realtime with a simple mouse scroll. Of course, one can always click on a window corner and drag, but from usage, I think that this is the quickest resize I've seen so far. The step size can be varied to make the resize operation faster or slower.
Link to Volumouse (FREE) : http://www.nirsoft.net/utils/volumouse.html
Link to ResizePlugin (FREE) : http://www.nirsoft.net/utils/volumouse_plugins/move_resize.html
Link to Volumouse (FREE) : http://www.nirsoft.net/utils/volumouse.html
Link to ResizePlugin (FREE) : http://www.nirsoft.net/utils/volumouse_plugins/move_resize.html