GRUB - Multiboot boot loader
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.
rEFIt - rEFIt is a boot menu and maintenance toolkit for EFI-based machines like the Intel Macs.
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.
EasyUEFI - Manage EFI/UEFI Boot Options & Manage EFI System Partitions & Fix EFI/UEFI Boot Issues