Rufus -

Formats USB drives to FAT, NTFS, exFAT, and more, while creating bootable USBs from diverse ISOs. Supports MS-DOS/FreeDOS with no external files and offers BIOS or UEFI mode, including bad block check. Ideal for systems lacking an OS or flashing BIOS and lightweight, ad-free.

rEFIt -

rEFIt is a boot menu and maintenance toolkit for EFI-based machines like the Intel Macs. You can use it to boot multiple operating systems easily, including triple-boot setups with Boot Camp. It also provides an easy way to enter and explore the EFI pre-boot environment.

rEFInd – Boot Manager -

rEFInd is a fork of the rEFIt boot manager for computers based on the Extensible Firmware Interface (EFI) and Unified EFI (UEFI). Like rEFIt, rEFInd is a boot manager, meaning that it presents a menu of options to the user when the computer...