Rescatux was the standard for grub repair in MBR and EFI systems. It has a ton of tools. Recent updates arent compatible with new machines and the system wont load anymore. If you have a GPU+CPU machine (like a AMD A6 R4) forget to use rescatux.
However if your machine is compatible, use rescatux as it's probably the best tool for repairing boot problems, disk management and thousand of thing more.
Acronis Cyber Protect Home Office - (Formerly Acronis True Image) Complete protection for your digital life
Hirens BootCD - Hirens BootCD is a powerful, all-in-one boot disk utility that will help you resolve and make reformatting your computer easily.
N2WS Cloud Protection Manager - N2WS is the leading Enterprise-class disaster recovery, and backup solution specifically made for Amazon EC2 servers.
Finnix - Finnix is a small, self-contained, bootable Linux CD distribution for system administrators, based...
HDclone - HDClone by Miray Software is the universal tool for cloning disks and other mass storage media fast and easily. To be used for backups, data recovery, system migration and professional duplication of several disks at a time.
Ultimate Boot CD - The last Boot CD you'll ever need. You need the Ultimate Boot CD if you want to: