BuiltWith - Find out the technology behind websites
Travel Diaries - Create your own travel diary to capture your experiences
Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
Magpie - Female travelers club - meet women like you when you travel
What CMS - WhatCMS.org looks at a variety of factors within a webpage to determine what CMS a website is using.
tripcake - Doodle for travel plans with friends