lfhex (Large File Hex Editor) is a hex editor with paged input/output for viewing and editing files which are too large for system memory. Features include infinite undo/redo, search capabilities, a conversion dialog, scalable working area (sane resize), fast load times, fast save times, and a binary graphical diff/compare UI. It only takes an additional ~1.4 MB to open a 2 GB file, and can graphically compare 4 GB files using less than 15 MB of additional system memory.
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.
jgraphpaper is a simple application for generating and printing custom graphpaper. It supports square and non-square grids with major and minor divisions. You can specify either number of major/minor divisions or the physical dimensions of each grid cell in 1/72th of an inch increments. It is great for using a whole piece of paper to sketch out a project. It also has defaults for typical home improvement scaled projects and also for knitting projects where a non-square grid comes in handy.