1crm.comSoftware by 1CRM Corp.
fruux - Free service that takes care of your contacts, calendars and more so you don't have to.
Bigin by Zoho CRM - Pipeline-centric CRM built and priced for small businesses
FullContact - Put the power of full contact information into your web or mobile apps.
Pobuca Connect - Connect with 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.
Pipeliner CRM - Pipeliner CRM empowers small to medium-sized sales teams to close more deals and lower risk. Implementation and training are a breeze. Mac & Windows.