EasyUEFI - Manage EFI/UEFI Boot Options & Manage EFI System Partitions & Fix EFI/UEFI Boot Issues
GRUB - Multiboot boot loader
Libreboot - Libreboot is a distribution of ...
Grub2Win - Safely dual boot Windows and Linux without touching the Windows MBR.
EasyBCD - EasyBCD is NeoSmart Technologies multiple award-winning answer to tweaking Windows bootloader.
BootIt Bare Metal - BootIt Bare Metal is a boot manager and partition manager software utility.