GanttProject is free Java based, project management software that runs on the Windows, Linux and Mac OS X systems. Developed by Dmitry Barashev, Alexandre Thomas
License: Open Source
Wrike is a comprehensive project management tool with advanced collaboration, reporting, and resource management features, making it ideal for teams and larger projects. In contrast, GanttProject is a free, open-source solution that excels in simple Gantt chart creation and offline access but lacks collaboration and advanced features.