Keep In touch - Keep in touch with thousands of people
DeepLink Kit - Add deep links to your app in 5 minutes.
The Contact Guru - Managing your contact list so you don't have to
DeepLink - Deeplink is a deep linking platform for native apps, enabling app developers to link to specific pages inside their apps.
Cardhop - The Mac contacts app you'll want to use.
pplQ - A daily nudge to keep in touch with someone important to you