lde is a disk editor for linux, originally written to help recover
deleted files. It has a simple ncurses interface that
resembles an old version of Norton Disk Edit for DOS. lde is 100
percent free under the Gnu public license.
I've put a little bit documentation on this site. There is a very
basic walkthrough of the editor which
includes something like screenshots. Also, you can read the
man page online and a file with some
tips on restoring deleted files using lde.
There's more information and the latest
binaries over at the
lde sourceforge project page.