Libreboot - Libreboot is a distribution of ...
GRUB - Multiboot boot loader
PLoP Boot Manager - The PLoP Boot Manager is a small program to boot different operating systems.
Grub2Win - Safely dual boot Windows and Linux without touching the Windows MBR.
Bootice - Download Bootice - Edit your computer's MBR and PBR settings with various built-in tools such as a partition manager, UEFI editor, BCD configurator, and more
EasyBCD - EasyBCD is NeoSmart Technologies multiple award-winning answer to tweaking Windows bootloader.