Magento 2: available field types in system.xml

Question

What are available values for field types in etc/system.xml configuration file:

<?xml version="1.0"?>
<config
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Config:etc/system_file.xsd">
    <system>
        <section id="...">
            <group id="...">
                <field id="..." type="???">
                    ...
                </field>
            </group>
        </section>
    </system>
</config>

Answer 1

Magento 2 system configuration provides below fields type.

checkbox,
checkboxes,
column,
date,
editablemultiselect,
editor,
fieldset,
file,
gallery,
hidden,
image,
imagefile,
label,
link,
multiline,
multiselect,
note,
obscure,
password,
radio,
radios,
reset,
select,
submit,
text,
textarea,
time

Answer 2

Looking at the file /lib/internal/Magento/Framework/Data/Form/Element/Factory.php (sources on Github, for Magento 2.2 & 2.3), one can find the following default list of elements, as specified by Amit in his answer:

// Factory.php, lines 26-55
protected $_standardTypes = [
    'button',
    'checkbox',
    'checkboxes',
    'column',
    'date',
    'editablemultiselect',
    'editor',
    'fieldset',
    'file',
    'gallery',
    'hidden',
    'image',
    'imagefile',
    'label',
    'link',
    'multiline',
    'multiselect',
    'note',
    'obscure',
    'password',
    'radio',
    'radios',
    'reset',
    'select',
    'submit',
    'text',
    'textarea',
    'time',
];

If Composer was used to install Magento, the data may also be found in /vendor/magento/framework/Data/Form/Element/Factory.php, as mentioned in Mohit's comment below.