Assign random materials to all selected objects or their islands or faces with a single click, either using a hue range or user set custom materials.
Control each material independently using custom palette or using a range of Hues, Saturation and Values.
Control Saturation and Value separately or as a whole using overwrite.
Assign each material Metalic, Roughness, IOR, Alpha.
Assign materials per object, or per island, or per face.
Control the color range to create harmonious palettes.

Press F7 to activate, or in Object Mode select it under "Object/Random Material " menu.