JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
The "Available Space" term and value you are seeing per our pricing page is the amount of file space you have to store uploads that are sent to you via your jotforms.
It can also be seen in your account while logged in by clicking the Human Avatar in the upper righthand corner for quickview or by going to https://www.jotform.com/myaccount/usage.
An example of something that would use this would be an upload form.