Hex Editor with file analysis capabilities and advanced editing

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

Synalyze It! features enhanced support for many character encodings and it will allow you to interactively define grammars for various file formats.
Here are some key features of "Synalyze It!":

• Hex Editor
• Histogram
• Compare code pages
• Incremental text search with encoding selection
• Find Text
• Find numbers
• Search for Mask