Mango - The first simple online payment solution in Latin America
BuiltWith - Find out the technology behind websites
Oysho - Oysho allows you to discover trendy outfits around the world easily.
Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
Ballwool - social network marketplace
What CMS - WhatCMS.org looks at a variety of factors within a webpage to determine what CMS a website is using.