Hugh Lashbrooke

“WooCommerce Smart Sale Badge” enhances the built-in sale badge by displaying the total saving amount a customer will receive. The plugin works with all the WooCommerce product types – simple and external products will display a badge that says ‘Save $X!’, while variable and grouped products will display ‘Save up to $X!’.
If you would like a more fully featured sale badge enhancement extension then be sure to check out Sale Flash Pro available for purchase from the WooThemes website: http://www.woothemes.com/products/sale-flash-pro/ (Sale Flash Pro was not written by me, but because WooCommerce Smart Sale Badge contains a limited feature set of Sale Flash Pro I will not be adding further features to this plugin).
<h3>Usage</h3>
Simply install and activate the plugin and you’ll be good to go.

WooCommerce Smart Sale Badge

Enhances the WooCommerce sale badge by displaying the total saving a customer will receive.

pimwick

Offer “Buy One, Get One Free” deals for your customers in a single step! 
Activating BOGO Free deals in your WooCommerce store has never been easier. Simply name your BOGO deal and click Publish. That’s it!
<blockquote>
The <a href="https://pimwick.com/pw-bogo" rel="nofollow ugc">Pro version</a> includes even more great features:
<ul>
<li>Buy X, Get X – For example, “Buy 3, Get 2 Free!”</li>
<li>% Off – For example, “Buy One, Get One 75% Off”</li>
<li>Spend X, Get X – For example, “Free Product with purchase of $25 or more”</li>
<li>Automatically add the discounted products to the customer’s cart</li>
<li>Optionally require a coupon to activate the BOGO</li>
<li>Limit the number of times the BOGO deal can be applied per order</li>
<li>Specify that only identical products or variations are discounted</li>
<li>Schedule begin and end dates for the promotions</li>
<li>Specify products by category</li>
<li>Include or exclude individual products</li>
<li>Eligible products can be different than the Discounted products</li>
<li>Options to exclude sale items or not allow other coupons in conjunction with BOGO offer</li>
<li>Compatible with all major payment gateways such as PayPal and Klarna.</li>
<li><a href="https://pimwick.com/pw-bogo" rel="nofollow ugc">Get these amazing features and more!</a></li>
</ul>
</blockquote>
Easy to end the promotion 
Simply open the BOGO deal and click Move to Trash.
Your time is priceless 
There are plugins that can be configured to offer BOGO Free deals but they are difficult to set up and require a lot of trial and error. If you’re looking for a straightforward BOGO Free promotion, this plugin is the way to go.
PW WooCommerce BOGO takes the guesswork out of offering Buy One, Get One deals. It’s so easy to use!

PW WooCommerce BOGO

as the title suggests, the plugin adds bogo for all products on the website.

Basically any product that is added to the cart, when a 2nd one is added the bogo is applied, no other controls, you can't limit the bogo to 1 product/category/discount item

plugin adds a bogo for all website products, no other options

PW WooCommerce BOGO Free makes Buy One, Get One promotions so easy!

WooCommerce Smart Sale Badge vs PW WooCommerce BOGO