Woocommerce Checkout Addons & Upsells is a Woocommerce extension that allows product upsells to be displayed on the checkout page and also additional checkout fields.
Product upsells are displayed on the checkout page and users can simply add the product to their order by just simply checking the checkbox

Available Addon fields are :

Text
Radio
Checkbox
Multi Checkbox
Dropdown
Multi Select
Text Area
File Uploader

Features

Add extra checkout addon fields
Add product upsells to checkout
Checkout addons fields are saved on the the order page in the admin
Fully localized