Typecard lets you create and share your digital business card for free. Share your business card with a QR code that you can easily add to Apple Wallet or Google Wallet. When people scan your code, they can see and save your contact details.
Uniqode - Uniqode: Revolutionizing QR Codes, Simplifying Solutions.
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.
Blinq - Find out if your dating matches are in the same place as you
Apple Contacts App - Access and edit your contacts from personal, business, and other accounts with the Contacts app.
Blinq.me - Create your free digital business card in seconds. Recipients don’t need the Blinq app to receive your card. Raise your networking game today.
Windows Contacts - Windows has many extraordinary organizers, and in the event that you include distributed storage, then you presumably have more.