UK GCHQ's CyberChef
github.com"The tool is designed to enable both technical and non-technical analysts to manipulate data in complex ways without having to deal with complex tools or algorithms."
Italics added; might be worthwhile pedagogically to actually teach these "complex" tools and algorithms instead. That said, the tool looks actually quite nice.
Well, it's true, however, it's nice to have a way of showing stakeholders about technologies behind security solutions altogether.