EasyBCD - EasyBCD is NeoSmart Technologies multiple award-winning answer to tweaking Windows bootloader.
Rufus - Rufus is a piece of software that allows you to transform a portable drive, like a flash drive or other USB drives, into a bootable drive that can be used for a variety of purposes. Read more about Rufus.
GRUB - Multiboot boot loader
YUMI - YUMI (Your USB Multiboot Installer), is a tool that allows you to boot multiple ISO files from one USB drive.
Grub2Win - Safely dual boot Windows and Linux without touching the Windows MBR.
Balena Etcher - Flash OS images to SD cards & USB drives, safely and easily.