indeed - Find jobs using Indeed, the most comprehensive search engine for jobs.
ContactRescue - Magically get your address book up-to-date and accurate
LinkedIn - LinkedIn is a business-oriented social networking service, mainly used for professional networking.
Cardhop - The Mac contacts app you'll want to use.
Monster.com - Monster.com is one of the largest employment websites and job search engine in the world.
Clearbit Connect - Clearbit Connect is a free extension that surfaces actionable information on the people who email you.