Fat Free CRM is an open source CRM software tool that is ideal for businesses looking for a system that they can completely customize. It is based on the popular Ruby on Rails platform, allowing it to be deployed on your own servers with ease. The entire CRM is completely free to use, with no monthly fees or paid upgrades. Fat Free CRM comes with all of the features found in a powerful CRM software, such as contact and lead management, sales campaign creation, customer interaction logging, lead scoring and many others. It can be installed out of the box or further customized by your development team prior to being deployed. The CRM's creators have put together useful guides for both developers and users that provide all the needed information to get started. The software is maintained by a worldwide community and free updates can be obtained from their website.