Camera RGB Color Picker is a pretty straightforward app. It lets you use your camera to grab colors from the things you point at. It can pull a few different colors from the same scene, and you ...

ColorPic is a free and simple utility with a single-minded focus: To help you grab colors from anywhere on your screen and assemble them into a palette you can use in your designs.

Searching 'RGB to Hex' brings up a simple color picker that shows results in RGB and Hex. You can search any Hex or RGB value, and it will show the color in both formats.