If you want to access SmartyStreets APIs (other than the Download API) from a Python application, the SmartyStreets Python SDK can make it a lot easier. The SmartyStreets Python SDK includes ready-made data structures and takes care of all the gritty, low-level HTTP intricacies for you.
Streetlayer is a white label API for real time international address validation, autocomplete and geocoding. This tutorial introduces the streetlayer API including ensuring high-quality data by validating addresses, delivering address suggestions and determining coordinates of street addresses.
FullContact has announced the CardShark API. The CardShark API allows users to "to send images of business cards to FullContact, and...receive back a response containing transcribed structured contact data." The advantage the API method of optical character recognition over competitors lies in the ability to send contacts to devices and applications beyond the device that captured the initial picture.
Our API directory now includes 82 address APIs. The newest is the 1Map API. The most popular, in terms of mashups, is the geocoder API. We list 41 geocoder mashups. Below you'll find some more stats from the directory, including the entire list of address APIs.