Where I can find source code for http://open365.io/ ?

Where I can find source code for http://open365.io/ ?

Try CODE by Collabora as this is possibly what the offered service is partially based on.

Open365 is completely different from CODE. Open365 use the native LibreOffice interface that is rendered to web browser, but CODE is a 100% native web interface.
In Open365 the full LibreOffice instance run on server side, but in CODE the UI part run on client side.

I’m interested too in open365 code location…

Thanks. I notice in this article it states:

the makers plan to release repositories that you can install on servers you have control over