Just Color Picker - Free portable colour picker and colour editor for web designers, photographers, graphic designers and digital artists. Supports Windows and macOS.
System Color Picker - Pick colors from anywhere using the built-in color picker.
Instant Eyedropper - Identifying the color code of an object on the screen is usually an involved, multistep process:...
Swatches - A fun and accurate color picker for the real world
gpick - A color picker and color scheme creation tool.
Sketch Palettes - Sketch plugin to save and load colors into the color picker