WebGradients is a free collection of 180 linear gradients that you can use as content backdrops in any part of your website.
The daily color digest
Color Claim was created in 2012 by Tobias van Schneider with the goal to collect & combine unique colors for my future projects.
Coolest handpicked Gradient Hues for your next super ⚡ amazing stuff
Khroma is the fastest way to discover, search, and save color combos you'll want to use.
Best Flat Colors For UI Design