Sales List by Prospect.io - A curated list of tools & resources for salespeople
BuiltWith - Find out the technology behind websites
Mailshake Omni - Sales engagement software for modern sales teams
Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
Bumpsale - Sell your awesome digital product using incremental pricing
What CMS - WhatCMS.org looks at a variety of factors within a webpage to determine what CMS a website is using.