Vtiger
Vtiger is a popular CRM software among startup owners. It allows businesses to effectively manage their customer contacts, run profitable marketing campaigns, close more sales and provide high-quality customer support. The system is fully cloud-based, so you'll always have access to your data, no matter where you are. If you want to deploy the CRM on your own IT infrastructure, there's a community-supported open source edition available as well, which you can download completely free, with no license or monthly subscription fees. Vtiger is designed to integrate flawlessly with other online applications and cloud-based systems your business may be using, such as PayPal, Twilio, Dropbox, QuickBooks and many others. If you want to find out whether this CRM works for you, the developers are now offering a free 15-day trial with no credit card information required. This allows you to see for yourself how the CRM works and what it can offer you.