Cygnus Hex Editor 

This is the fastest and easiest hex editor available anywhere! Tabbed MDI interface, multi-level undo & redo, extensive drag & drop support, blazing search/search & replace, file comparison, delete and insert characters like a word processor, more.
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HexCmp 

HexCmp is a program, which combines together the features of a binary file comparison application and a convenient hex editor. The program will help you to compare files in binary format, at the same time serving as a hex editor that will edit files.
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