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JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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We have the Data Grid widget which allow you filter data only, as far as I know we do not have such a widget that will enable the user to add more data to it.
If you want to, I could forward your request to our development team to have such as widget, but I can not assure you it will be approved or if it is approved, there is not estimated time frame for it's implementation.