Hexadecimal file editor with abilities to insert and delete, edit both
a file's Data and Rsrc forks, compare files, show disassembled PPC
code, much more. Written from 1993 until 2008.

dL #1 is 2008 version 2.2 for OS X 10.4 &up (app only)
dL #2 is 2008 version 2.2 for OS X 10.3 &less, including Classic OS &
68k (app only)
dL #3 is 2004 version 1.9.1 having a nasty bug in its Find&Replace,
however this archive has complete documentation and source code.
dL #4 is version 1.8.5, also with complete documentation and source
code. Kept here for historical purposes.
dL #5 is version 1.2. Kept here for historical purposes.
dL #6 is 2002 version 1.9.2
dL #7 is 2008 version 2.2 for System 7.5 to OS 9, including docs,
change history, etc.

One annoying bug persists in the highest v2.2 where the red traffic
light in an OS X window's top left does not darken if changes have
been made, the red button remain bright always.

The source code and documentation for the latest version can still be
found in its official SourceForge page, along with HexEdit in other
languages and multiple earlier versions:
<https://sourceforge.net/projects/hexedit/files/>
<https://sourceforge.net/projects/hexedit/files/OldFiles/>

Compatibility
Architecture: 68k PPC (Carbonized) x86 (Intel:Mac)

SSW 7, Mac OS 8, Mac OS 9 & Mac OS X. FAT (68k/PPC) & Carbon binaries.

dL #1 (Universal Binary) is better suited for OS X 10.4 and higher.
dL #2 is better suited for OS X 10.3 and older.
dL #7 is best suited for System 7.5 to OS 9