Custom XML Form mod_bfcustomxmlform

This module allows you to create a user enterable form using Joomla! standard form fields.

https://docs.joomla.org/Standard_form_field_types

You can also access custom fields available in any installed Joomla! extension.

On form submission the entered data can be sent out in an email and / or be stored in the database.

Form validation is included and can be extended to suit your requirements.