IBored

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Hex editor for disk sectors, but can also be used to edit files, including disk images. Formerly released under the name rohPod.

 Author:    Thomas Tempelmann
 Homepage:  http://apps.tempel.org/iBored/
 Family:    HexEditorFamily
 License:   Freeware
 Availability: yes
 Platform:  Windows, Linux, OS X

Features

Can view disks in custom block sizes.
Deals gracefully with read errors: You can copy a partially-damaged disk to an image file (bad blocks will become zero-filled in the copy) in order to use recovery tools on the error-free copy then.
When modifying data, a "journal" file is written to your desktop that contains the previous data of the altered blocks, and it can be used to undo your changes.
Can view partitions and other subranges as containers with their own start, length and block size.
Can be re-launched with admin (root) rights to access non-removable disks (Mac OS X only).
Detects connected iPods, showing their firmware partition contents.
Can access disks remotely over a network connection.
Can save a range of blocks to a file and write a file back to disk.
Has a powerful template system to view and analyse disk structures.
Can edit MBR and GPT partition tables.
Can install a PC BIOS bootloader dealing with both MBR and GPT.

Screenshot: