GRUB - Multiboot boot loader
EasyBCD - EasyBCD is NeoSmart Technologies multiple award-winning answer to tweaking Windows bootloader.
Clover EFI bootloader - This is EFI-based bootloader for BIOS-based computers created as a replacement to EDK2/Duet...
Grub2Win - Safely dual boot Windows and Linux without touching the Windows MBR.
EasyUEFI - Manage EFI/UEFI Boot Options & Manage EFI System Partitions & Fix EFI/UEFI Boot Issues
Grub Customizer - Grub Customizer is a graphical interface to configure the GRUB2/BURG settings and menuentries.