SOGo is a very fast and scalable modern collaboration suite (or groupware). It offers calendaring, address book management, and a full-featured Webmail client along with resource sharing and permission handling. It also makes use of documented standards (IMAP, CalDAV, CardDAV, etc.) and thereby provides native connectivity (without plugins) to many clients such as Microsoft Outlook, Apple iCal, the iPhone, Mozilla Lightning, and a plethora of mobile devices via SyncML. It can reuse any existing email and database infrastructure, avoiding long hours of site restructuring.
Schoorbs is a system to make room and resource bookings through a Web 2.0 GUI. You can also interact with it through a REST API. It allows you to book rooms and resources grouped by areas. Activity can be logged via a simple logging interface. The code is automatically tested by several unit tests. The interface can easily be styled through the usage of a template system. Schoorbs produces valid XHTML 1.1 output, has packages for Debian and Ubuntu, and is well documented online.
eHour is a Web-based time registration tool for project-based businesses. The primary objective is to keep time tracking as simple as needed while still being very effective at measuring and reporting the amount of time your team spends on a project. eHour is available as a standalone version or a WAR file, which you can deploy in your existing environment. eHour is JVM (Java & Scala) based.
Auto Project Planner automatically calculates a proper project plan based on your effort estimations and the due dates you have in mind. A list of tasks and a list of employees can be defined. Tasks can be assigned to one or more employees. It is also possible to define a maximum percentage value an employee can/should work on a task. Public holidays, leaves, weekly working hours, and more parameters can be specified and are considered in the calculation. According to this input, the software computes time plans by minimizing the MSE (mean squared error) between expected and computed end dates.