Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
Everything by Voidtools - Everything. Locate files and folders by name instantly. Everything. Small installation file. Clean and simple user interface.
Google Contacts - Google Contacts is Google's contact management tool that is available in its free email service Gmail, as a standalone service, and as a part of Google's business-oriented suite of web apps Google Apps.
DocFetcher - DocFetcher is a portable German/English open source desktop search application.
FullContact Card Reader - Automagically scan biz cards into LinkedIn/Gmail contacts
X1 Search - X1's Lightning-Fast Search Software. Premium Alternative to Windows Desktop and Outlook Search.