Material Palette - Generate and export your Material Design color palette
Colorion - Curated color palettes with search and tags support
Picular - Google, but for colors.
ColorPicker - Get useful color information like combinations, blindness simulation, libraries matching and converson in RGB, HSB, HSL and more.
Material @ Colorion - Material design compatible curated color palettes.
Cheeky Palettes - Colour palettes in the context of real landing pages