Xindus's answer:
ShopRunner - ShopRunner is a members-only online shopping service that offers consumer-friendly and free shipping services.
FedEx - FedEx app features the creation of a large number of national and international shipping labels so you can keep a record of the status of the online package right at your fingertips.
WebShopApps - WebShopApps offers Magento extension development services.
Delhivery - Delhivery is an E-commerce logistics solution.
ShipStation - Seamless eCommerce shipping fulfillment software. Wherever you sell, however you ship, ShipStation can help. Auto order import, batch label print, & more!
Shiprocket X - Cross-Border Shipping Made Easy