Super Grub2 Disk is a live CD that helps the user to boot into almost any operating system even if the system cannot boot into it by normal means. This allows a user to boot into an installed operating system if their GRUB installation has been overwritten, erased or otherwise corrupted. Super Grub2 Disk can detect installed operating systems and provide a boot menu which allows the user to boot into their desired operating system. Super Grub2 Disk is not an operating system itself, but a live boot loader which can be run from a CD or USB thumb drive.

Release notes:

https://www.supergrubdisk.org/2019/09/08/super-grub2-disk-2-04s2-beta2-released/

https://www.supergrubdisk.org/super-grub2-disk/

https://sourceforge.net/projects/supergrub2/

https://distrowatch.com/table.php?distribution=supergrub