Rufus
Create bootable USB drives the easy way – Rufus is a utility that helps format and create bootable USB flash drives, such as USB keys/pendrives, memory sticks, etc.
It can be especially useful for cases where:
- you need to create USB installation media from bootable ISOs (Windows, Linux, UEFI, etc.)
- you need to work on a system that doesn’t have an OS installed
- you need to flash a BIOS or other firmware from DOS
- you want to run a low-level utility
Source: https://rufus.akeo.ie/.
Perfect alternative to UNetbootin.