usps topic
php-tracking-urls
Converts package tracking numbers into URLs (UPS, FedEx, USPS, and more)
kargo
Kargo determines the carrier of a tracking number barcode and checks if that tracking number is valid
snail
A Ruby gem to assist with collecting and formatting international addresses
shippo-php-client
Shipping API PHP library (USPS, FedEx, UPS and more)
shippo-node-client
Shipping API Node.js library (USPS, FedEx, UPS and more)
tracking_number
Identifies valid tracking numbers and a little bit more
shippo-python-client
Shipping API Python library (USPS, FedEx, UPS and more)
delivery-tracker
delivery tracking library for Node.js
karrio
Programmable Shipping API (self-hosted)