radare, the reverse engineering framework
[http://radare.nopcode.org/y/?p=features](http://radare.nopcode.org/y/?p=features)010 Editor
hex templates for binary formats parsing
[http://www.sweetscape.com/](http://www.sweetscape.com/)
[http://habrahabr.ru/post/213211/](http://habrahabr.ru/post/213211/) (rus)