rEFIt

rEFIt is a boot menu and maintenance toolkit for EFI-based machines like the Intel Macs.

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.

EasyUEFI

Manage EFI/UEFI Boot Options & Manage EFI System Partitions & Fix EFI/UEFI Boot Issues

GRUB

Multiboot boot loader

Grub2Win

Safely dual boot Windows and Linux without touching the Windows MBR.

Metal

Apple’s low-level, hardware-accelerated 3D graphic and compute shader API.