Prospect Stack - 100 ways to generate more prospects
Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
FindThatLead Prospector - Feed your sales team with daily leads.
BuiltWith - Find out the technology behind websites
Sales List by Prospect.io - A curated list of tools & resources for salespeople
What CMS - WhatCMS.org looks at a variety of factors within a webpage to determine what CMS a website is using.