Hex Color Picker is described as 'puts an extra tab in the system-wide color panel. Instantly see the hex color code for any color, and edit it just the same with a number of shorthands' and is an app in the Photos & Graphics category. There are more than 50 alternatives to Hex Color Picker for a variety of platforms, including Windows, Mac, Online / Web-based, Linux and iPhone. The best alternative is Just Color Picker, which is free. Other great apps like Hex Color Picker are gpick (Free, Open Source), Instant Eyedropper (Free, Open Source), gcolor2 (Free, Open Source) and Sip (Paid).
Instant Eyedropper is a free color detection tool for webmasters that will identify and automatically paste to the clipboard the HTML color code of any pixel on the screen with just a single mouse click.
gcolor2 is a basic colourpicker utility that allows you to select any colour on your screen, and, well, grab it's colour. It also allows you to save the colour you create to a file, which shows up as a list in the application.
The refreshingly simple color picker for developers that instantly samples and encodes any color on your screen. Just one quick click to savor the flavor and you're set! See what’s on special with Sip below.
Pixel Pick is a free color picker tool that pick the pixels color under your mouse cursor on the desktop and translates it into a number of different color formats such as RGB, CMYK, HSB, HEX or Web Color format. A free color picker for grabbing color under your mouse .
Small utility that can show you coordinates and color of any pixel on your screen in different formats (HEX, HTML, RGB, CMYK, HSV). It's staying on top, displays a color of that pixel under mouse cursor, the program can magnify that zone w/ hotkey.