Floorplanner
Club penguin is a free virtual site for kids. Also try Millsberry or Neopets, their not virtual, but their free and fun!
webkinz
There are many places to find free software to build a website. A good place is the website "allaboutyourwebsite" to find free software to build a website.
babydow.com
Go to thw webs website and you make it there
The Microsoft Virtual Academy is the best website to learn ASPx for free.
You can download google sketchup for free and build a virtual 3d representation if that is what you mean.
It is a free virtual website.
Virtual horse ranch!
Many websites do have it for free, however the full version has to be bought. BigFishGames.com has it for free.
first you have to go to build a bear workshop and get a build a bear and you'll be able to get a free house and 2,000bear bills and a special item!