Source: uCalc is a universal builder of calculators and forms

The free version of uCalc allows you to create up to 3 different forms or calculators. The forms can be used collect information, or, in combination of the calculator, can collect information that is calculated based on what the user entered.

The forms part of uCalc is not as powerful as Google Forms, but it does offer some nice features such as the aforementioned ability to calculate. Students could create a form to help them with math homework or to understand how grades are calculated.