Open Source CRM Software
If your project starts to grow so large and complicated that you can no longer keep track of all of your clients in a simple spreadsheet, it may be time to upgrade to Customer Relationship Management (CRM) software.
The packages available from Oracle, SalesForce, and Microsoft are bloated and costly. Choose an open source CRM that's free and has the features that you need!
For my technical and financial consulting project, I use a heavily customized SuiteCRM install.
http://zurmo.org/ - "Zurmo is an open source Customer Relationship Management (CRM) application written in PHP utilizing jQuery, Yii Framework, and RedBeanPHP."
http://suitecrm.com/ - "The organisation that manages, directs and finances the SuiteCRM project is SalesAgility. SalesAgility was one of SugarCRM's earliest adopters and most fervent open source project supporters. Known globally as a source of SugarCRM knowledge and project excellence, SalesAgility has been implementing, supporting and developing the Community Edition of SugarCRM since 2006. SuiteCRM is an open source alternative to SalesForce Professional, Microsoft Dynamics and SugarCRM Professional Edition."
http://www.x2engine.com/open-source-crm/ - "X2CRM is a free open source CRM software project created by X2Engine, Inc. in Santa Cruz, CA. X2Engine CRM offers a full and powerful customer relationship management application, freely sharing the open source code through a git repository for everyone to utilize and customize. X2CRM is a PHP application built on the modern Yii framework, an open source web application development framework that “promotes rapid development”. As such, the code base is constantly developing and being improved upon. The app has grown to include the sales force automation and marketing automation of X2Engine, the full intelligence system operating on X2CRM.
https://www.vtiger.com/open-source/ - "Supported by a vibrant community of tens of thousands of businesses, hundreds of thousands of users, and countless developers and partners that help shape its direction, it's no wonder that today Vtiger CRM is considered the most powerful open source CRM solution available, having seen more than 3 million downloads to date."
http://www.opencrx.org/ - "openCRX is an open CRM solution that meets the needs of organizations requiring multifunctional, enterprise-wide coordination of sales generation, sales fulfillment, marketing and service activities to customers, partners, suppliers or intermediaries"
http://www.orocrm.com/ - "OroCRM is an easy-to-use, open source CRM with built-in marketing tools for your ecommerce business. It's the CRM both marketing and sales can agree on!"