Screen Tester - Each slide will show an image that makes any dead/stuck pixels, discoloration, scratches, and dust...
InjuredPixels - Easily check your PC, laptop, tablet, smartphone, connected screen or TV for dead pixels, scratches...
Dead Pixel Buddy - web app tool to detect dead pixels on lcds plasmas tvs
Dead Pixel Locator - Locate dead pixels or lit pixels on your LCD monitor or plasma displays, TVs.
lcdtest - LCD monitor test pattern generator
Monteon - Free online-service to test a computer monitor, laptop screen, TV or mobile device display