I created the Exam Simulator prototype as a free alternative to VCE format exam simulators. While my Exam Simulator can be used for any type of test, I saw a huge hole in the technical certification market. There are many sites that charge high fees to download VCE files or to purchase their exam simulators. Companies can do so because VCE files are binary and it seems that much of the code capable of reading them is proprietary. It all makes sense financially. I feel like a free or lower cost alternative using JSON could gain a large share of the market if enough time and resources were invested. If a JSON based system is financially viable is another question.