Hex Viewers/Editors

• emacs (text editor for Unix) - using hexl mode
  http://www.phys.ufl.edu/docs/emacs/emacs_422.html
• Hex Workshop (BreakPoint Software) - "can edit, cut, copy, paste, insert, and delete hex, print customizable hex dumps, and export to RTF or HTML for publishing" and "find, replace, compare, add smart bookmarks, and generate character distributions within a sector or file"
  http://www.bpsoft.com/
• HView – very simple and lightweight hex viewer (can drag and drop a file into it to view hex dump)
• WinHex – many more features for forensic analysis than HView
  http://www.x-ways.net/winhex/
• XVI32 (Christian Maas)
  http://www.chmaas.handshake.de/delphi/freeware/xvi32/xvi32.htm