What are the utilities for drawing up a site / program scheme?

Question

Project management

On the example of a site: first comes the main one, branches to internal pages go from it, then on these pages you can perform some action, for example, click a button with a form, and so on.
It is necessary that all this can be represented in the form of a "tree", guides, description, and so on.
Like how the project looks in Adobe Muse, or like in the screenshot.
And then save as pdf or jpg.

Answer 1

https://www.draw.io/ is an excellent solution in conjunction with google apps, and draw.io pro is there, as I understand it, included in the tariff (google apps for one user - $ 5). More than a comprehensive tool

Answer 2

To build many types of business diagrams, including flowcharts, Gantt charts, and UML, I use the Creately online service ( creately.com/). It is quite easy to use, allows you to make various layouts and schemes and share them with the right circle of people.