Cardhop - The Mac contacts app you'll want to use.
Veloxy - A sales enablement app. Your calendar on steroids!
Keep In touch - Keep in touch with thousands of people
Vipor CRM - Relationship management. Redesigned.
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.
Support Hero - Educate your customers through self-help support