Dribbble Color
Dribbble Color is a wonderful tool that allows you to display all dribbble shots, based on a certain color.
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uiGradients
uiGradients is a community contributed collection of beautiful multi-color gradients, free to use on your next UI or design project.
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.
Grabient
A great tool that generates linear gradients, with the ability to customize each gradient, and download the CSS gradient code.
Coolors
The super fast color schemes generator! The Coolors app allows you to create, save and share perfect color palettes in seconds!