What software is used to create 3D floor plans like these?

There are 100s of programs out there that will do that. Therefore there is no way any of us can look at the picture and tell you which specific one did it.

Here is a link that shows you your options. Most of these programs come with a free trial. What I recommend you do is install free trials and test them out to see if they will do what you want and if so then you can buy it.

https://www.google.com/search?q=how+to+take+screenshot+in+windows+10&ie=&oe=#q=software+to+create+3d+floor+plans&spf=202

The main professional one is "Chief Architect"
https://www.chiefarchitect.com/

They have a low cost, DIY version called "Home Designer"
https://www.chiefarchitect.com/home-designer-DIY/

Research: Google Sketchup

Hi Meow
very expensive cad software not free and may need a large capacity drive and large ram to construct it.