The Apache Open For Business Project is an enterprise automation software project that includes ERP, CRM, E-Business/E-Commerce, SCM, MRP, and CMMS/EAM functions. It is a foundation and starting point for enterprise solutions and can certainly be used out of the box, but is also great for creating specialized applications.
NmnNewsletter is a Web application designed to provide a simple but full featured newsletter and messaging manager for Web sites running on PHP 4.x or 5.x and MySQL. It implements lots of useful features including newsletter saving and editing, previewing and presending to test addresses, logs, and statistical data concerning newsletters and users alike. It also has some extra features like HTML to text auto conversion for sending multi-part messages, auto generation and insertion of an unsubscribe link, tracking of who reads your messages and when, and more.
Tine 2.0 is a Web-based groupware solution that focuses on usability and correctness. To achieve these goals, the project uses usability experts and covers most of the code by unit tests. It contains support for contacts, tasks, calendar, email, CRM, VoIP integration, a time tracker, ActiveSync, and a flexible rights management system.