BORG
BORG is a combination calendar and task tracking system. The calendar supports simple todo's. The Task Tracker goes way beyond todo's.

Ganttproject
Ganttproject lets you plan projects using a Gantt chart. It is written in Java. GanttProject use a XML file format. It can export the project in HTML Web pages or PDF document (using XSLT) or image files. It support 21 languages.

Memoranda
Memoranda (formerly known as jNotes2) is an open source cross-platform diary manager and the tool for scheduling personal projects.

MPXJ
This library provides a set of facilities to allow project information to be manipulated in Java. MPXJ supports three file formats, Microsoft Project Exchange (MPX), Microsoft Project (MPP), and Microsoft Project Data Interchange (MSPDI).

Rapla
The objective of the project "Rapla" is to provide an easy-to-use resource-management system. The primary target of the program are universities. Rapla allows coordination beetween the lectures and the administration in allocating (booking) the available resources. The main goal for the 1.0 version is to provide a framework for general resource-management.

Teamwork
Teamwork is a software application specifically for team work management. If your company works in teams then this is the application for you, as you can manage large volumes of information and operate effectively with your team members on complex projects.

XPlanner
XPlanner is a project planning and tracking tool for eXtreme Programming (XP) teams.