color match
ColorFOff - Get Color from Screen

ColorFOff is an Open Source Portable Desktop Color Picker. It can be used to get the HEX color value of any pixel color presented on your screen. Once running, simply left click in the label field and then drag your mouse pointer over any area on your desktop (while holding the left click button), and the HEX value of that pixel will be displayed. The Color Picker can be toggled to and from the system tray by clicking the tray icon.
Pixie Portable Color Picker

Pixie is a free and lightweight portable color picker tool created by Nattyware. This software makes it simple to instantly identify and copy the HEX, HTML, RGB, CMYK, and HSV values of any pixel color on your screen or monitor. Whether you’re a web designer, graphic artist, UI/UX developer, or digital creator, Pixie offers a fast way to grab exact color codes directly from your screen.
CatchColor: Reveal the Hex Color Value of any Pixel

CatchColor is a compact and FREE portable color picker tool for Windows that lets you instantly reveal the hexidecimal color value or color code of any pixel on your screen. Ideal for web designers, graphic artists, and UI developers, it helps you identify, copy, and use precise color codes in your projects without installing any bulky software.