The inspecting/editing tools in scenes on Three.js examples pages

Questions
1

What is the tool(s) that is used in this example scene and various other example scene pages showing fps etc. on the top left corner of the scene and controls on the right side of the scene?

Is it included in three.js as an inspecting/editing utility or is it a third party software?

2

It’s actually an independent software project:

3

Are those too?

4
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