The Currency Converter Widget lets you offer a dynamic currency switcher for displaying product prices and totals.
The Buy One Get One Free plugin allows to create offers of the type: if the customer adds to cart a specific quantity of a product, then give away one or more items of the same or another product.
Want to convert your WooCommerce store into a Quote only program? This plugin allows the admin to hide the prices on a per product basis and modify the Add to Cart button to ‘Request Quote’. No payment is taken at Checkout. The prices for the product can be setup in the WooCommerce->Orders page and once a quote is finalized, the plugin will send an email to the end user notifying the same. The users can then make the payments using the link in the email or the My Accounts page.
The checkout field editor provides you with an interface to add, edit and remove fields shown on your WooCommerce checkout page.