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
2017 Grabient by unfold
Copy Paste Color Pallette from Flat UI Theme
Color Claim was created in 2012 by Tobias van Schneider with the goal to collect & combine unique colors for my future projects.
Curated gradients for designers and developers
Best Flat Colors For UI Design