GRUB - Multiboot boot loader
U-Boot - Das U-Boot (the Universal Bootloader) and Embedded Linux
EasyBCD - EasyBCD is NeoSmart Technologies multiple award-winning answer to tweaking Windows bootloader.
coreboot - coreboot is an extended firmware platform that delivers a lightning fast and secure boot experience...
Grub2Win - Safely dual boot Windows and Linux without touching the Windows MBR.
LILO Boot Loader - LILO stands for Linux Loader, is a boot loader tool that is used to load Linux OS into memory.