Relationship 

Relationship is a powerful business tool that helps you keep record of all your employees, projects, notes and many other; this efficient application will also give you access to a built-in e-mail client that will instantly notify you about all incoming e-mails.

Its interface is very intuitive, as it's designed for both beginners and professionals. You will be able to add contacts to your personal address book, take notes, manage projects, schedule events and many others. The program will also provide you with a handy search engine that will help you find any type of information you need in just a matter of seconds.

A significant advantage of using this application is the fact that it brings you a built-in e-mail client that informs you whenever you receive e-mails from your clients or co-workers; just input your personal e-mail address and password and the program will deliver instant notifications of the incoming e-mails.

Additionally, you can set the program to automatically save all made modifications at any time interval; simply go to Preferences and chose the autosave period.

All in all, if you are looking for an efficient way to keep track of your client lists, projects or notes, you should definitely give Relationship a try.