DataBasic - Easy-to-use web tools for beginners
Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
Popcornmetrics - Track user behavior without coding
BuiltWith - Find out the technology behind websites
Curious Polls - Answer a question once a day for the chance to win £100/$100
What CMS - WhatCMS.org looks at a variety of factors within a webpage to determine what CMS a website is using.