usps topic

Converts package tracking numbers into URLs (UPS, FedEx, USPS, and more)

darkain

Kargo determines the carrier of a tracking number barcode and checks if that tracking number is valid

unicod3

A Ruby gem to assist with collecting and formatting international addresses

cainlevy

Shipping API PHP library (USPS, FedEx, UPS and more)

goshippo

Shipping API Node.js library (USPS, FedEx, UPS and more)

goshippo

Identifies valid tracking numbers and a little bit more

jkeen

Shipping API Python library (USPS, FedEx, UPS and more)

goshippo

delivery tracking library for Node.js

egg-

Programmable Shipping API (self-hosted)

karrioapi

Shipping API Ruby library (USPS, FedEx, UPS and more)

goshippo