Which Script is Used to Create a Site like seotooladda.com

Good Day BHW,

I am a member of one of the Group Buy website where we use all of the tools right inside the website.

Could someone please tell what script they use or how we can do that? I need to use something like that on one of my website.
Where user don't leave my site and can access other sites within my domain name.

Example:
https://prnt.sc/xDPMiWqDQuPt
https://prnt.sc/n90lKZ9fJPPf
This people are using some scripts to open the other websites right within their domain name.
TIA.

you can open up another site / page of another site in an iframe, but I'm not sure whether there are other ways of doing it. But iframe does exactly that for sure

Also, the screenshots look like sub-domains. You can easily add as many sub-domains as you want inside of your cpanel

I don't know which script that site is using, though...

I am also interested in knowing the script they use. Any one with info?