Here four free software to create Bootable USB are given below:
1. ZOTAC WinUSB Maker
This is one of the first Bootable USB Creators that I used. ZOTAC WinUSB Maker has been my most reliable companion every time I intended to create one. We all know ZOTAC as a company that manufactures Graphics Cards, Mini PCs or other digital boards or hardware like SSDs.
The main highlighting features of this tool are its compatibility with Windows XP and higher with .NET Framework 4.0 installed, Smooth and simple GUI based operation, Quick operations, x64 and x86 support and UEFI Support, etc.
Rufus is another very famous and easy to use bootable USB Maker. This supports all kinds of USB Pendrives, Keys, Memory Sticks, etc. The minimum software requirement is that it needs Windows XP at least.
It supports both UEFI and GPT installations and is also open source. It is free.
3. Windows USB/DVD Download Tool
Windows USB/DVD Download Tool is also a really simple tool to create a bootable USB Drive. All you need to have a pen drive and an ISO file. First, select the ISO file, check the destination drive and all the other booting settings. Now after you pass through all the four steps by clicking next, you have your bootable pen drive ready.
It is fast, multipurpose and is so feature rich. You can create various images from archives or folders; you can create bootable USB drives at a very great speed. Plus, it is portable and requires very fewer system resources.