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.
SyMenu is a Start Menu replacer that provides you with the ability to organize your portable applications quickly. It can be installed in pen drives, external USB disks, memory cards, and even CDs and DVDs.