Just Color Picker - Free portable colour picker and colour editor for web designers, photographers, graphic designers and digital artists. Supports Windows and macOS.
FastStone Image Viewer - FastStone Image Viewer is a fast, stable, user-friendly image browser, converter and editor.
gpick - A color picker and color scheme creation tool.
Photoscape - high quality photo editing software, that enables you to fix and enhance photos.
Instant Eyedropper - Identifying the color code of an object on the screen is usually an involved, multistep process:...
IrfanView - IrfanView ... one of the most popular viewers worldwide.