Easy USB Creator Lite is a lightweight utility that easily converts ISO images into bootable USB sticks.
The UI for Easy USB Creator Lite is simple, and the process is equally so - a single click can turn Windows setup DVDs and multiple recovery utilities into bootable USB drives that are perfect when you need to install or recover a Windows while on the go.
Rufus is a small Open Source utility that helps quickly format and creates bootable USB flash drives, such as USB keys/pen drives, memory sticks, etc. Rufus is now integrated with Fido to download Windows 10 and 8.1 ISOs from Microsoft servers. Video guide available.
WinToUSB will install and run the Windows operating system on a USB hard drive or USB flash drive, using an ISO image or CD/DVD drive as the installation source.