Programs that peek inside files and disk sectors so you can see what's inside them or so you can modify their contents.
FRHED Windows-based hex editor with Microsoft Visual C++ source code. Freeware. (http://www.kibria.de)
Freeware Hex Editor Hex editor for peeking inside files and disk clusters. Freeware. (http://www.chmaas.handshake.de/delphi/freeware/xvi32/xvi32.htm)
Hex Workshop A powerful hex editor for examining the contents of files and disk clusters. Shareware. (http://www.bpsoft.com)
UltraEdit Hex editor with a dictionary for spell-checking. Trialware. (http://www.idmcomp.com)
VEDIT Hex editor that can edit files up to 2 gigabytes in size. Includes a manual stored as an Acrobat PDF file. Trialware. (http://www.vedit.com)