Color Hunt is a free and open platform for color inspiration with thousands of trendy hand-picked color palettes.
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.
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.
A great tool that generates linear gradients, with the ability to customize each gradient, and download the CSS gradient code.
Color palettes generator, ColorSpace is a space for everything that has to do with color palettes and gradients.