ImHex is a powerful hex editor designed for reverse engineers, programmers, and those who prefer to work at 3 AM without burning out their retinas. This editor supports a wide range of features, such as byte patching, patch management, infinite undo/redo, various display options, and different data visualization capabilities. Controversially, ImHex requires a GPU with OpenGL 3.0 support, but software-rendered versions are available for systems without a GPU. Surprisingly, this editor also offers a dark mode by default, with customizable theming options and support for custom fonts. Additionally, the Pattern Language allows for custom programming to define structures and data types for content parsing and highlighting.
https://github.com/WerWolv/ImHex