ShipStation

I started using shipstation about 3-4 years ago and love the integration between shopify and shipstation. You can do stand alone shipments through shipstation; as well as shipstation can give you reports on cost of shipping between any storefront used. This is my go to program and shipping rates are great and the best deals possible on ups when I can ship a package for $10 compared to $16 on other programs. Highly recommended for sure!