Gradient by ShopFactory is a great tool for finding wonderful gradients, to use in your next project. It allows you to manipulate the gradients based on color, pigment and lightness.
The super fast color schemes generator! The Coolors app allows you to create, save and share perfect color palettes in seconds!
Color palettes generator, ColorSpace is a space for everything that has to do with color palettes and gradients.
Color Hunt is a free and open platform for color inspiration with thousands of trendy hand-picked color palettes.