Encycolorpedia - Providing hex color schemes, paint matching & search, color directory and color space conversions.
Material Design Palette Generator - Get perfect Material Design palettes from any hex color.
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.
Social Colors - Click-&-Copy the colors of various websites
RGB.to - RGB.to is a free online RGB color conversion tool that comes with an easy way to convert any type of color.
Material Palette - Generate and export your Material Design color palette