Those are officially maintained.
You also can find various useful third-party snippets here:
https://github.com/ocornut/imgui/wiki
imgui_memory_editor
https://github.com/ocornut/imgui_club/tree/master/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);
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