GRUB - Multiboot boot loader
EasyBCD - EasyBCD is NeoSmart Technologies multiple award-winning answer to tweaking Windows bootloader.
Grub2Win - Safely dual boot Windows and Linux without touching the Windows MBR.
PLoP Boot Manager - The PLoP Boot Manager is a small program to boot different operating systems.
Lilo - Try the search engine Lilo and finance social and environmental projects with your daily searches.
Visual BCD Editor - Visual BCD Editor - advanced GUI version of bcdedit utility. for Windows 7/8/10 and Vista