010 Editor 

010 Editor is a professional hex editor designed to edit any binary file, drive, or process on your machine. Use our unique Binary Templates technology to understand any binary format. Includes a whole range of powerful analysis and editing tools.
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ED for Windows 

ED is a smart language sensitive programmer's editor, with a breadth and depth of powerful editing capabilities you're unlikely to find elsewhere. ED goes beyond editing with its Source Database Engine, unmatched Visual File Compare, Compiler support
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