WinToFlash is a useful tool that can help you create a bootable Windows setup USB drive from a CD or DVD. WinToFlash can also make bootable USB versions of LiveCD’s.
Free USB ISO creation for Windows
Rufus is a free, crowdsourced resource for creating bootable USBs. The program only works on Windows, but it can create ISO for software installation that works on Mac, Linux, and other operating systems. It also helps you to be able to import a new OS onto a computer that has none or an incomplete system step through a USB.