GRUB, short for the GRand Unified Bootloader, is a free and open-source software suite used to load and manage operating systems on a computer. It is the most widely-used bootloader for Linux-based systems. GRUB can be used to boot a variety of operating systems, including Linux, Windows, BSD, and Mac OS X. It can also be used to boot multiple operating systems on the same machine, allowing users to switch between them without having to reboot. GRUB is highly configurable and customizable, allowing users to customize the boot process to their specific needs. It is a powerful tool for system administrators, allowing them to control and manage the boot process of their machines.
REFI discontinued. It has no longer been maintained since 2013. The author suggested visiting http://alternativeapp.info/software/refind/, a fork of the original program.
Discontinued The project is no longer maintained. The latest version, released on October 18, 2010, can still be downloaded from Google Code.
Discontinued Since XOSL is no longer maintained, but can still be used, a modified version comes from the original version: see https://sourceforge.net/projects/xosl2/.
Discontinued The project seems to be no longer updated. The latest version can still be downloaded from the official website, in the Early Works section.
Discontinued In May 2015, gummiboot was fully integrated into systemd to form its systemd boot component that serves as a UEFI boot manager. Following this action, the gummiboot source code repository was emptied in July 2015. - https://en.wikipedia.org/wiki/Gummiboot_(software)