Gantt Project
- Graphical Java program for editing Gantt charts. GPL
- http://ganttproject.biz

Eberom
- CRM and Project Management Tool developed with Java and running with MySQL and TomCat. [GPL]
- http://sourceforge.net/projects/eberom/

Air Todo
- Offers a project management tool with zero administration.
- http://airtodo.sourceforge.net

activeCollab
- Web based open source project management solution similar to basecamphq. [PHP]
- http://www.activecollab.com/

jToDoList
- Provides a todolist application written in Java.
- http://developer.gauner.org/jtodolist/

Track+ Issue Tracking System
- Web based tool for bug, issue, and task tracking. Offers Gantt charts, diagrams, configurable workflows, email reminders of due tasks and PDF reports.
- http://www.trackplus.de

Gforge Project Management Tool
- This part of the GForge collaborative development environment allows fine-grained control over tasklists, bugtracking, and gantt charts, with account management integrated into the overall product.
- http://gforge.org/

WebCollab
- A web-based system for projects and project management.
- http://webcollab.sourceforge.net/

WR Time Tracker
- PHP-based work time tracking system, under X11-style "Liberal Freeware License".
- http://products.wrconsulting.com/wrtimetracker

Projectory
- Open source, platform-independent, web-enabled project management tool for software projects based on Perl and MySQL.
- http://projectory.sourceforge.net/

ScrumWiki
- Simple Wiki-based tool for applying Scrum project management techniques. Collaborative, open source, cross platform and with full version control.
- http://scrum.minty.org

Project/Open
- Web-based project resource planning system, with project rooms, and tools for managing clients, invoices, time, and cost. Designed for the advertizing, IT consulting, translation and knowledge management sectors.
- http://www.project-open.com/

Taskjuggler
- A tool to schedule and track complex projects. The textual project description is compiled into schedules, status reports and GANTT charts.
- http://www.taskjuggler.org

Austin
- C++ parser for which converts XML-based project files into Gantt charts.
- http://austin.sourceforge.net

dotproject
- BSD-licensed PHP-MySQL web-based project management application, with Gantt chart support.
- http://www.dotproject.net/

FUTURe Project Planner
- A time management application written in Java including todo lists, Gantt charts, diaries, pert charts. Currently in early project stages.
- http://www.wolfkeeper.uklinux.net/FUTURe/

Achievo
- A web-based project management tool, offering basic project and customer management. (PHP)
- http://www.achievo.org

Double Choco Latte
- Issue tracking and project management. Part of Gnu Enterprise project.
- http://dcl.sourceforge.net/

PHProjekt
- Web-based groupware tool which includes calendar, project-management, time-card management, PDA synchronization, email, voting system and personal to-do list management.
- http://www.phprojekt.com

Project Management Interface
- Web-based project management application. Provides portal management to a large number of coarsely-managed projects.
- http://majordojo.com/pmi/

PyGantt
- Reads a project description from a XML formatted file and outputs an HTML Gantt diagram.
- http://www.logilab.org/pygantt/

ToutDoux
- A project manager for GNOME part of the GNU project. French/english.
- http://www.gnu.org/software/toutdoux/

TUTOS Groupware Suite
- Web-based groupware suite.
- http://www.tutos.org