Use this plugin to boost your overall sales or just to distribute a free product. The free product, your gift, will be automatically added to your visitor’s cart.
The WooCommerce Special Gift Plus WordPress plugin
extends your current sales strategy with an ability of automatic free product adding to the cart. A specific free item will appear in your client’s shopping cart after you set it in the administration panel.
Check out WooCommerce Special Gift Plus
details and demo page.
There is a light version available here