It shows availabel shipping methods, costs and order totals in the shopping cart.
For guests, shipping methods and costs show based on country, zone and zip code.
For logged in users based on selectable shipping address.
It is separated in 2 modules:
Estimated Shipping and Estimated Order Totals
Both modules can be easy added to the Shopping Cart.
English, Spanish and German language files included.
Version: 6.4
This can be extended to the Two page checkout App which allows to use the ship in cart module instead of the standard shipping page:
2 Page Checkout
Installation:
easy, no file modifications
Compatibility:
Phoenix Cart 1.0.8.6+
Tested with Phoenix 1.0.9.7.
PHP 7.0-8.3
Support Forum:
Ship In Cart Phoenix Cart 
