Disk, Volume, and Hex Editors
Disk & Volume, and Hex Editors on OS X
Disk & Volume Editors
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iBored
Basically a hex editor for disk sectors, but can also be used to edit files, including disk images. This program comes with hardly any documentation, and it doesn't explain what it does, either. If you have not used other tools to edit disk blocks or files on a binary level before, you may find it difficult to use. Macintosh OS X, Linux, and Windows.
wxHexEditor
Can edit HDD/SDD disk devices or partitions in raw up to exabyte sizes, but tested only to 1 PetaByte files :-). Macintosh OS X (Intel only), and Linux.
http://wxhexeditor.sourceforge.net/
Download link:
Synalyze It!
Synalyze It! allows you to create a grammar for binary files interactively. Unlike in regular hex editors or viewers, the files are interpreted automatically for you. Macintosh OS X only.
FEdit
FEdit is a program writen in php using mySQL (minimally). FEdit stands for File Edit, which is exactly what it does, it edits files on a server though a nice web interface. Macintosh OS X, Linux, and Windows.
HDIUTIL - UNIX Utility
hdiutil uses the DiskImages framework to manipulate disk images, no actual editing. Common verbs include attach, detach, verify, create, convert, compact, and burn. Macintosh OS X and UNIX.
https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man1/hdiutil.1.html
fileXray
fileXray is a Mac OS X command-line application for analyzing, dissecting, monitoring, scavenging, and performing forensic investigation on HFS+ file system volumes. Macintosh OS X, Linux, and Windows.
010 Editor
Text Editor, Hex Editor, Disk Editor, Process Editor. Macintosh OS X, Linux, and Windows.
0xED
Free. Unlimited file size (limited by what the actual file system supports). Instant opening of files of any size. Resource fork editing. Macintosh OSX only.
Hex Fiend
Free. Insert, delete, rearrange. You are not limited to in-place changes. No file size limit. Includes binary diff function. Also available as a framework for embedding in your own applications. Macintosh OSX only.
http://ridiculousfish.com/hexfiend/
Framework:
Disk Inventory X
Disk Inventory X is a disk usage utility. It shows the sizes of files and folders in treemaps. Macintosh OS X only.
File Peek
Use the built-in hex editor, get MD5, SHA1, SHA256 hashes and Base64 encoding with one click, or even change the modified and created dates. Macintosh OS X, Linux, and Windows.
DHEX
DHEX includes a diff mode, which can be used to compare two binary files. Since it is based on ncurses and is themeable. With its utilization of search logs, it is possible to track changes in different iterations of files.
Installation: http://macappstore.org/dhex/
Macintosh OS X, UNIX, Linux.
Hex Folder Scanner
It will search a folder for any file that contains a specific hexadecimal string. Macintosh OSX only.
Mac App Store.
iHex
Hex editor, file information viewer, and checksum utility. Macintosh OS X only.
Download from App Store.