Vtiger
Vtiger is a complete system of CRM applications providing you with both sales automation and help desk functionalities. With this CRM, you get everything you need to run your daily operations in the most efficient way possible. The user interface is very simple to figure out and provides all of your team members with a 360 degree view of all contact details, including past interactions. With its visualized sales pipeline, all of your staff will be able to see how their deals are doing, so they never lose another valuable sales opportunity. You can also reach out to your customers, leads and contacts instantly with one-click emailing, as well as built-in calling features. Vtiger is available in two editions. One is hosted in the cloud for you by the developers and comes with all features, including professional support when you need it. There is also a free open source edition that you can immediately deploy on your own servers and customize to your organization's needs.