http://twd6bfktlkhwluhj2ghjthx55pnp2dcuuhf6qqjz7vm2krsmwpz6crad.onion/9-best-open-source-gantt-chart-tools-for-linux/index.html
GanttProject supports the import of Microsoft project files, spreadsheets, text files among others. Similarly, you can export your project as a pdf, image, spreadsheet, Microsoft project file, etc. It’s free to use and available for Linux, Windows, and macOS. You can also pay USD 5+ to support this project by buying its paid version.