are there any free web-based tools for interior designing?

I just want to play around with space design but was wondering if anyone out there knows of and has used web-based designing tools?

Interior Design Degree – Making Your Career Soar

You can get an interior design degree online from a number of reputable universities including Penn Foster and Ashworth University.
If this is a career that you are interested in, you probably want to know a little about the types of classes that are required, the amount of time it takes to receive certification and the [...]