A very useful free color wheel and color palette generator for designers and developers. You can also upload an image to get colors from it.
The super fast color schemes generator! The Coolors app allows you to create, save and share perfect color palettes in seconds!
Dribbble Color is a wonderful tool that allows you to display all dribbble shots, based on certain colors.
Color Hunt is a free and open platform for color inspiration with thousands of trendy hand-picked color palettes.