Synalyze It! is a simple-to-use OS X Hex Editor which will allow you to easily edit and analyze binary files of any size.

Synalyze It! features enhanced support for many character encodings and enables you to interactively define "grammars" for various file formats to speed up analysis and reduce manual decoding of files. Incremental search for strings and numbers, printing and other features make it a quite powerful tool.

Some key features:

• Hex Editor
• Printing
• Histogram view
• Automatic suggestion of grammars
• Compare code pages
• Incremental text search with encoding selection
• Find text
• Find numbers
• Search for masks
• See all strings in a file