AfterShip - AfterShip is the shipment tracking API for ecommerce businesses and marketplaces.
17track - All-in-one package tracking
Cabubble - Taxi and minicab quotes for London, Birmingham, Manchester and throughout the UK. Book a licensed taxi or minicab online via website or mobile app.
PostTrack.com - Universal Parcel Tracking System
OnTime 360 - Cloud-based courier software with online order entry, route optimization, and dynamic tracking. The complete delivery software solution.
Instant Parcels - Package & Delivery Tracker.