ColorPicker is a modern Open Source color-picking tool.
ColorPicker allows you to pick a color from your screen, or you can pick a color manually via shift S; it then keeps a color history so you can go back and review the selected colors. ColorPicker can also randomly choose a color for you if desired. Colors can then be converted to another type (RGB, HEX, HSL, HSV, CMYK). It has a sleek UI that can be mildly customized with light/dark themes available through settings.
ColorPicker is straightforward and offers enough features and options that can be useful in several different scenarios like web design.