HTML-Notepad - HTML WYSIWYG editor for structured documents

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.

Notepadqq - Notepadqq is a linux clone (identical application) of Notepad++

Malcat - Malcat is a feature-rich hexadecimal editor / disassembler for Windows and Linux for malware analysts, incident responders, CTF players and SOC operators.

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.

PE-bear - PE-bear is a reversing tool for PE files.