#1
WooCommerce Custom Product Addons, Custom Product Options
WooCommerce product addons plugin lets you add unlimited extra product options by using a variety of field types like text area, text field, upload file, drop-down, check-boxes, multiple select, etc. WooCommerce add ons plugin streamlines product customization for the end users.
#2
WooCommerce Custom Fields
WooCommerce Custom Fields allows you to create custom product, checkout, order and user fields, provide and gather additional information in a structured way, and sell configurable products, product add-ons and extra product options. Build, manage and optimize your online store for a premium user experience, and make every field work for you.