Programs
DefectPX
DefectPX allows you to easily check for dead or defective pixels on LCD monitors. Use it to test new LCDs before purchasing or during the warranty period. DefectPX fills the entire screen with one of the colors that make up a pixel, allowing you to inspect the screen for pixels that do not match the selected color. DefectPX can be run directly without having to install it on your computer: just download and run. Free Software
FocusDrape
FocusDrape instantly blanks your computer screen, except an area of the screen you want to focus on (such as a YouTube video, a photo or a text editor). Use it to focus on your current task and make all other windows (or ads) disappear, without having to manually clean up your desktop or close any window. Free Software
