What can you use to create an office layout in a browser?

Question

Software and Internet Services

Greetings!
It seems I came across similar solutions before, but now I can’t find something suitable.
I would like to install some service (php, node.js) on my website (intranet) and use the built-in editor (js, html5 etc) to draw a diagram (map) in it that will be saved on the server and it will be possible to open it and change it again in the future .
In the simplest version, it is enough to draw lines, rectangles, and make notes.
It is desirable that the notes could contain links, images (html code).
Ideally, hosted elements should be customizable.

Answer 1

realaxy.com/#!/catalog

Answer 2

draw.io