at amazon.co.jp, as any product, can get lowest price, shop name, shipping price...etc

Stamps is Stamps.com backed library for creating postage labels, calculate the shipping cost of packages, standardize domestic addresses via USPS CASS certified Address Matching Software, and track shipments.

Ruby implementation of EnviaYa! shipping service.

With this Gem it is possible to order pre-paid shipping stickers from the Deutsche Post. Payment is done through the so called "Portokasse", a prepaid wallet service. To use this Gem a registration for the "Portokasse" and the 1C4A webservice is necessary.

NinjaVan 3PL shipping service API Caller for Ruby

This gem is a wrapper on Wing API v2, that offers shipping services (https://www.wing.eu).

Overseas shipping ruby gem for UPS and DHL apis.

Integrates Packeta shipping service with Spree Commerce using their SOAP API for packet creation, tracking, and label generation

API for evaluating transactions against direct-to-consumer Beverage Alcohol shipping regulations. This API is currently in beta.

Ruby SDK for working with TNT shipping web services.

Allows to generate shipping labels and to perform some of the Endicia basic operations.

A Simple Ruby Class that communicates with Canada Post Server and provides a shipping estimate.

CCbill Shipping and tracking fulfillment system

Facilitates check digit calculation for intermodal shipping containers.

Horatio, shipping your Docker images from a CI server

This is to customize fedex gem

Adds temando shipping support to Spree

Allows advanced calculators such as weight etc to be applied on shipping methods

Ruby wrapper around Auction Inc's shipping API.

Ruby SDK for the FlexOps multi-carrier shipping platform API. Supports USPS, UPS, FedEx, DHL with rate shopping, label generation, tracking, webhooks, wallet, insurance, returns, and more.