accessiBe - Making websites accessible to people with disabilities

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

Sim Daltonism - From the perspective of a color blind person, some colors are impossible to distinguish.

gpick - A color picker and color scheme creation tool.

Coblis - If you are not suffering from a color vision deficiency it is very hard to imagine how it looks...

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