LeadBring - Automate your LinkedIn workflow
BuiltWith - Find out the technology behind websites
Marketing for Startups - 47 practical tactics to get customers and achieve hockey stick growth.
Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
Toby for LinkedIn - Save yourself needless clicks and your precious time & See company info without exiting the profile pageSimple as that
What CMS - WhatCMS.org looks at a variety of factors within a webpage to determine what CMS a website is using.