Those are officially maintained.
You also can find many useful third-party snippets here: https://github.com/ocornut/imgui/wiki/Useful-Extensions

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imgui_memory_editor

https://github.com/ocornut/imgui_club/tree/main/imgui_memory_editor

Mini hexadecimal editor! Right-click for option menu. Features: Keyboard controls. Read-only mode. Optional Ascii display. Optional HexII display. Goto address. Highlight range/function. Read/Write handlers.

Usage

static MemoryEditor mem_edit;
mem_edit.DrawWindow("Memory Editor", data, data_size);

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imgui_freetype

Note: imgui_freetype.cpp has been moved from imgui_club into the main imgui repository, inside the misc/freetype/ folder: https://github.com/ocornut/imgui/tree/master/misc/freetype