Zoho
Customer Relationship Management (CRM) Software is becoming more and more important for modern business. Zoho CRM is one of the most prominent and widely used CRM software systems that offers a "Freemium" model. Try it initially and upgrade to access all the tracking, data analysis and integration features that you need for your growing business. Zoho has all the standard features including account status updates, contact information, email marketing applications, webmail integration and modern invoice system. However, the company has also recently provided a mobile solution for on-the-go access. This is especially helpful for sales people in the field. Overall, Zoho is one of the most widely used and expertly made CRM software systems. Try it out and upgrade when ready.