Rescatux is a GNU/Linux rescue cd (and eventually also Windows) but it is not like other rescue disks. Rescatux comes with Rescapp. Rescapp is a nice wizard that will guide you through your rescue tasks.
Rescatux is a Debian based live cd that lets you fix your GRUB1 and GRUB2 installations (as per Super Grub2 Disk lacks) but does much more. Here the are some of its features :