ISO ToolKit provides a set of functions which make it easy to create, extract, and generally work with disc images.
You're able to build an ISO image from a source folder, for instance. Or there's an option to create one directly from a CD or disc drive.
If you have an image already then you're able to extract its contents in a click or two (and this option works with NRG and BIN/ CUE images, too).
If your image isn't in a format you can use then the program may be able to convert it for you; again, it can read and write ISO, NRG and BIN/ CUE files.
And in theory, at least, ISO Toolkit should be able to mount ISO, NRG and BIN/ CUE files as virtual drives, so you can access their contents without having to burn the image to disc. Although in reality this proved the only disappointment, as the Mount Image feature didn't work at all on our test Windows 7 PC.