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.
DiskPatch - Did the entire hard disk go blank? Does Windows complain that the volume needs to be formatted?
Hirens BootCD - Hirens BootCD is a powerful, all-in-one boot disk utility that will help you resolve and make reformatting your computer easily.
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Finnix - Finnix is a small, self-contained, bootable Linux CD distribution for system administrators, based...
RecoveryRobot Partition Recovery - Best partition recovery software program app free download | Recover data, file, images, videos and more from lost, deleted, damaged partitions on hard drives.
Ultimate Boot CD - The last Boot CD you'll ever need. You need the Ultimate Boot CD if you want to: