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.
Communifire - Enterprise Social Collaboration Software
FullContact Card Reader - Automagically scan biz cards into LinkedIn/Gmail contacts
Workplace by Facebook - Connect everyone in your company and turn ideas into action.
Cleartones - Minimalist ringtones
Unily - Unily is a cloud-based intranet solution designed by SharePoint consultancy BrightStarr.