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.
Gradient by ShopFactory
Gradient by ShopFactory is a great tool for finding wonderful gradients, to use in your next project. It allows you to control the gradients based on different settings.
uiGradients is a community contributed collection of beautiful multi-color gradients, free to use on your next UI or design project.
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.