Date: 2015-10-19
These are all online tools you can use with your webbrowser. Most of these tools help you choose a palette - base on a primary color. They will give you an additional 3-7 colors. They are mostly mobile-friendly.
material palette https://www.materialpalette.com/
Color Wheel - Color Calculator http://www.sessions.edu/color-calculator
Paletton.com http://paletton.com/
Adobe Color CC https://color.adobe.com/create/color-wheel/
Another fun tool, the default works best in full screen mode.
Color Brewer 2.0, color advice for cartography http://colorbrewer2.org/
HTML Color Picker http://www.w3schools.com/tags/ref_colorpicker.asp