Loqate is the most advanced software for capturing, verifying and enriching address data globally - delivering the unrivalled precision businesses need.
Smarty - Smarty provides address validation, autocomplete, geocoding and reverse geocoding services covering addresses in over 240+ countries.
BuiltWith - Find out the technology behind websites
AccuZIP - AccuZIP Postal Software and Data Cleansing For Direct Mail Marketing
Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
Melissa Data Quality - Melissa helps companies to harness Big Data, legacy data, and people data (names, addresses, phone numbers, and emails).
What CMS - WhatCMS.org looks at a variety of factors within a webpage to determine what CMS a website is using.