GRUB - Multiboot boot loader
coreboot - coreboot is an extended firmware platform that delivers a lightning fast and secure boot experience...
Clover EFI bootloader - This is EFI-based bootloader for BIOS-based computers created as a replacement to EDK2/Duet...
Systemd-Boot - Systemd-Boot, formerly known as Gummiboot, is one of the simplest UEFI boot managers that lets you boot Linux and Windows in EFI mode even if the system is BIOS only supported.
Libreboot - Libreboot is a distribution of ...
Grub2Win - Safely dual boot Windows and Linux without touching the Windows MBR.