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.
Tiny PXE Server - Small portable standalone PXE server (dhcp+tftp+http)
Hirens BootCD - Hirens BootCD is a powerful, all-in-one boot disk utility that will help you resolve and make reformatting your computer easily.
ERPXE - ERPXE project simplifies the process of installing and customizing a Multi-Boot PXE server.
Finnix - Finnix is a small, self-contained, bootable Linux CD distribution for system administrators, based...
Serva 32/64 - Serva is an Automated PXE Server Solution Accelerator based on an all-in-one portable multi-server engine
Ultimate Boot CD - The last Boot CD you'll ever need. You need the Ultimate Boot CD if you want to: