Adobe Color CC - Generates color themes that can inspire any project.
ColorZilla - ColorZilla is an extension for Mozilla Firefox and the Mozilla Suite.
Coolors.co - The super fast color schemes generator! Create, save and share perfect palettes in seconds!
Paletton - Color Scheme Designer
cyotek color pallete editor - Cyotek Palette Editor allows you to create and work with colour palettes, in a variety of formats such as JASC, GIMP and Adobe Photoshop.
iWantHue - Colors for data scientists. Generate and refine palettes of optimally distinct colors.