Just Color Picker - Free portable colour picker and colour editor for web designers, photographers, graphic designers and digital artists. Supports Windows and macOS.

Adobe Color CC - Generates color themes that can inspire any project.

Sip - A better way to collect, organize & share your colors.

Colllor - With Colllor it is much easier to generate a consistent color palette with just a few clicks.

Instant Eyedropper - Identifying the color code of an object on the screen is usually an involved, multistep process:...

iWantHue - Colors for data scientists. Generate and refine palettes of optimally distinct colors.