The Web UI is great and you can share and export in.
As of June 2011, the number of weekly downloads of GanttProject (version 2.0.9) at SourceForge was third among such programs: first was OpenProj (version 1.4), second was JFreeChart.InfoWorld reviewed GanttProject favorably.
Average daily download count is about 1,500.
Exchange data with spreadsheet applications via CSV and Excel formats GanttProject is GPL-licensed (free software) Java based, project management software that runs under the Microsoft Windows, Linux and Apple macOS operating. Today’s 1 Cloud-based CPM Scheduling Tool and the perfect MS Project alternative.
Microsoft Project import/export with file format MPX (*.mpx) and MSPDI (*.xml) (XML-based data interchange format since Project 2002).It has a number of reporting options (Microsoft Project, HTML, PDF, spreadsheets). It does not have features like cash flow, message, document control, and resource leveling. It features most basic project management functions like a Gantt chart for project scheduling of tasks, and doing resource management using resource load charts. Comparing to other full-fledged project management software, one could say that GanttProject is designed considering the KISS principle.