Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
Eventzilla - Eventzilla lets you sell tickets online and manage attendees from one integrated application.
BuiltWith - Find out the technology behind websites
Cvent - Cvent's event management software provides event planners with a complete solution to increase event attendance and decrease event costs.
WhatRuns - Extension that helps you identify technologies used on any website at the click of a button.
Attendify - Develop relationships at the events that you attend by creating smaller events with just a few people.