Coolors is one of the very best colour creation and inspiration tools around. To get started you simply hit the space bar to generate a random colour palette, then you can lock colours you like to generate a palette based on your selection.
You can refine each individual colour as you wish via the standard colour systems (HEX, RGB, CMYK etc) as well as adjust the hue, saturation, brightness and temperature of your overall palette. When you have your final palette it can be saved and exported in a format of your choice.