I have 7 people using a gantt project, need colaborative

[DmitryBarashev]

Did you try reading GanttProject Cloud Docs?

What is GanttProject Cloud

GanttProject Cloud is a collaboration service for GanttProject Desktop application. Why you may want to use it? It keeps your project files in the cloud, so that you and your colleagues can access them from everywhere. Your collaborative work is safe with locking, concurrent update detection and file history. You can manage access permissions by grouping your collaborators into teams. It is seamlessly integrated into GanttProject Desktop. If you ever thought of using WebDAV, Dropbox or Googl…