​retoolkit: This is a collection of tools you may like if you are interested in reverse engineering and/or malware analysis on x86 and x64 Windows systems.
Online Hex Editor:
HexEd.it - Browser-based Online and Offline Hex Editing
HexEd.it
CyberCheef
CyberChef
Windows VM's from Microsoft:
Transferir uma máquina virtual do Windows 10 - desenvolvimento de aplicações do Windows