Vtiger
Vtiger is the open source CRM software for you if your objective is not only to accelerate and optimize how you do business, but also have the confidence that you're doing everything right. This CRM is different than most other products you'll see on the market today. CRM systems tend to either be completely focused on sales and marketing, or just customer support tasks. Vtiger comes in three versions that will suit any organization. There's one for sales, one for help desk activities, as well as the "Ultimate" package that combines both functions. The open source nature of this CRM makes it highly attractive if you prefer to stay in control of your business software and data by deploying them to your own servers. The open source edition is supported by a vibrant community of users and developers, which keeps the Vtiger project alive and moving forward.