Cardhop - The Mac contacts app you'll want to use.
indeed - Find jobs using Indeed, the most comprehensive search engine for jobs.
Keep In touch - Keep in touch with thousands of people
LinkedIn - LinkedIn is a business-oriented social networking service, mainly used for professional networking.
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.
Jobvertise - Free online jobs database, easily post jobs and search resumes.