In general, HIEW (Hacker's View) is a console hexadecimal file viewer and editor that can be used to change one or two bytes in its own or someone else's application. HIEW includes a built-in x86-64 assembler and disassembler and supports NE/LE/LX/PE/PE32+/ELF/Mach-O executable formats. The program also has many different features that make it easier to find, replace and edit data, as well as useful functions such as: encryption/decryption, built-in calculator, keyboard macros, etc. A free demo is available; the full version is paid.
Hiew provides a fast platform for in-depth examination and editing of binary files, with support for many executable formats.