https://material.io/resources/color/#!/?view.left=0&view.right=0
Color Tool - Material Design
Create and share color palettes for your UI, and measure the accessibility of any color combination.
material.io
http://colormind.io/bootstrap/
Colormind - Bootstrap UI colors
See the color palette applied to a demo landing page. For this palette, lighter shades will appear on the left. For best results try selecting the main (middle) color and generating the rest of the palette.
colormind.io
Color Palette Generator - Create Beautiful Color Schemes
Search, discover, test and create beautiful color palettes for your projects
colors.muz.li
Color Designer - Simple Color Palette Generator
The main purpose of this tool is to help with building a color palette and generate tints and shades based on it. Just pick a color, and the app does the rest. You can use the preselected colors or the color picker for more control.
colordesigner.io
ColorSpace - Color Palettes Generator and Color Gradient Tool
Just Enter a Color! And Generate nice Color Palettes
mycolor.space