Paletton - Color Scheme Designer
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.
HTML CSS Color Picker - HTML CSS Color Picker is an online website that provides you an extravagant color scheme that can be shared anywhere else.
Color Hunt - Curated collection of beautiful colors, updated daily
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.