xScope - xScope is an excellent utility that is used to measure the graphic layouts or any application’s dimensions for checking the operating systems’ compatibility with the desktop screen.
Undesign - Free design tools and resources for your projects
PixelSnap - Measure every pixel on your screen with ease ✨
DesignValley - Discover, vote and share your favorite design tools 🥇
PixelSake - PixelSake is an excellent screen management program that allows users to select the different icons, objects, applications’ interface, and more with easy-to-use cropping tools or personalized specifications.
2015 Design Tools - Results from survey of 4,000+ designers on their fave tools.