A great tool that generates linear gradients, with the ability to customize each gradient, and download the CSS gradient code.
Color Hunt is a free and open platform for color inspiration with thousands of trendy hand-picked color palettes.
The super fast color schemes generator! The Coolors app allows you to create, save and share perfect color palettes in seconds!
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.