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
Avaza offers a comprehensive suite of project management tools with a focus on collaboration and invoicing, making it suitable for teams that need extensive features. In contrast, GanttProject is a lightweight, open-source tool that excels in Gantt chart creation but lacks some advanced functionalities, making it ideal for users who prefer simplicity.