The Product Vendors extension for WooCommerce allows you to turn your store into a multi-vendor marketplace (such as Etsy or Creative Market). You can assign existing products to vendors, or they can add and edit their own ones - they will have a dedicated page on the site where they will be able to list all of their products, but they will also show up in your normal shop pages so you can sell your own products alongside those of your vendors. To make things even more useful, you have complete control over how much commission each vendor receives for a sale and you can even manually add new commissions and edit existing ones.