Fat Free CRM is a piece of customer relations management software that is not only entirely free to use, but it is free to change and optimize for any business as well. The software uses an open-source system that allows anyone to make changes or tweaks to the software, and those changes can then be ported to the rest of the users who want to take advantage of them. This is a highly versatile and reliable piece of CRM software. Fat Free CRM is Ruby on Rails-based, so it is one of the more powerful open-source systems of its type on the market. There are a ton of online demos and add-ons that can be downloaded to customize the app for any brand, and it has a plethora of standard out-of-the-box functionality for streamlining the sales process, such as campaign management, lead tracking, contact list creation, salesforce collaboration, and much more.