EssentialPIM - EssentialPIM is a free Personal Information Manager that keeps up with the times and lets you manage appointments, tasks, notes, contacts, password entries and email messages across multiple devices and cloud applications.
Evercontact - Your contacts always up to date and automatically with Evercontact.
Bitrix24 - Bitrix24 is a free (for small businesses) social enterprise platform. It is a united work space which handles the many aspects of daily operations and tasks. Create your own social intranet in minutes!
CONTACTBOX - CONTACTBOX combines the simplicity of an address book with effective functions of a CRM system.
Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.
Bigin by Zoho CRM - Pipeline-centric CRM built and priced for small businesses