You got a binary file and don't know its contents. Or some software creates binary files where you have a specification but don't want to decode them manually. 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! Synalyze It! costs $4.99, but some features are only available in the Pro version at $24.99
A fast and clever open source HEX editor for Mac OS X.
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