VBinDiff (Visual Binary Diff) displays files in hexadecimal and ASCII (or EBCDIC). It can also display two files at once, and highlight the differences between them. Unlike diff, it works well with large files (up to 4 GB).
VBinDiff was inspired by the Compare Files function of the ProSel utilities by Glen Bredon, for the Apple II. When I couldn’t find a similar utility for the PC, I wrote it myself.
The single-file mode was inspired by the LIST utility of 4DOS and friends. While less provides a good line-oriented display, it has no equivalent to LIST’s hex display. (True, you can pipe the file through hexdump, but that’s incredibly inefficient on multi-gigabyte files.)
I would like to hear from anyone who uses VBinDiff, especially if you find it useful. You can find my contact information here.