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GRUB - Multiboot boot loader
EasyUEFI - Manage EFI/UEFI Boot Options & Manage EFI System Partitions & Fix EFI/UEFI Boot Issues
Grub2Win - Safely dual boot Windows and Linux without touching the Windows MBR.
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
Grub Customizer - Grub Customizer is a graphical interface to configure the GRUB2/BURG settings and menuentries.
Gag - GAG (initials, in spanish, of Graphical Boot Manager) is a Boot Manager program.