Apps with 'Built-in Color picker' feature
GIMP is a free program for such photo retouching, image composition and image authoring. Essentially it's the closest thing to Photoshop you can get for free.
Paint.net is a free and very capable image editing software for Windows. Great alternative to Photoshop for people that do not need all the stuff PS offers.
You can use Image to view your digital images and photos of many different formats. .
Features a free draw tool, arrows, lines, circles, and other tools for editing screenshots you take. There is no Text Box or Comment Feature.
A color picker and color scheme creation tool.Features:Create palettes from images, Color scheme creation tools, Fast color picking, Magnification
A cross-platform vector graphics tool, runs as desktop application and in-browser too.
Lines is a modern and minimalist text editor - IDE with support for over 150 programming languages, embedded code inspectors and many other cool tools to help you write better code. .
DigitalColor Meter is a utility built into Mac OS X for measuring and displaying the colour values of pixels displayed on the screen.
Free Color Picker is a program that lets you capture the color of any pixel displayed on the screen.
CSS Scan Pro is a browser extension that makes it radically easy to get the looks of any website. Hover over any element, and copy its entire CSS with a single click.
SVG Splash is a beautifully simple SVG painting application for coloring SVGs. No account required or settings to configure. Open and get started immediately. Key features: