I do landscaping and woodworking projects at home. Many times I want to step away from the computer and sketch out my designs before I start. I threw together a basic graph papper generator so I can use the whole page for my project, no rulers required.
It also has a setting for creating non-square grids (at the request of my mom for knitting projects :)).
Summary
Tonality is a GUI-driven utility that streamlines the typical B&W image conversion process. It thumbnails images in B&W for quick preview. It allows previews based on individual color channels. It also makes adjusting individual channel contributions without changing the overall exposure easy.