FullContact Card Reader - Automagically scan biz cards into LinkedIn/Gmail contacts
Knowee - Don't print your cards - Impress your contacts.
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.
Mobilo Metal Card - The premium digital business card
ContractHero - Intuitively organize contracts and be reminded of deadlines
Neucards - Update your contact info with friends while protecting your privacy.