This plugin will add a custom fee for Cash On Delivery payment method in WooCommerce. It is a very simple plugin with only two options. Fee amount and Fee title (what the user will see as explanation for the extra charge).

Discount for the first order for Woocommerce.

Woocommerce add-to-cart addon adds duration or increments to products. Opens in Settings > Unitizr

Add fees to your store Cash on delivery payments

Set fees and discounts for WooCommerce payment gateways.

Shipping method extension for the WooCommerce e-commerce plugin. This adds a "delivery" shipping method that can have a fixed value price or a percentage of the cart total.