Notepad++ - A free source code editor which supports several programming languages running under the MS Windows environment.
HxD - HxD is a carefully designed and fast hex editor which, additionally to raw disk editing and...
Notepad3 - Notepad3 is a fast and light-weight Scintilla-based text editor with syntax highlighting.
Hex Workshop - Hex Workshop: Hex Editor, Sector Editor, Base Converter and Hex Calculator for Windows
TED Notepad - TED Notepad is a portable text editor software that deals with a large variety of text processing tools, supplemental text clipboards, high accessibility through hotkeys, and a customizable number of settings and options.
IDA - The best-of-breed binary code analysis tool, an indispensable item in the toolbox of world-class software analysts, reverse engineers, malware analyst and cybersecurity professionals.