iWantHue - Colors for data scientists. Generate and refine palettes of optimally distinct colors.
Encycolorpedia - Providing hex color schemes, paint matching & search, color directory and color space conversions.
Adobe Color CC - Generates color themes that can inspire any project.
Perbang - Perbang is an RGB and multi-tool chart that allows you to have extensive color schemes that can be shared and downloaded with ease.
Coolors.co - The super fast color schemes generator! Create, save and share perfect palettes in seconds!
BeautyColorCode - BeautyColorCode is a reliable platform for getting your colors right, courtesy of the extensive color scheme library that is easy to share and download.