Planfred is already successfully used for very large projects. Thousands of plans and documents per project may be uploaded and easily managed without losing sight of things.
And once a project is completed, simply download the complete project as a locally executable app, no matter how large it has gotten!
More improvements over the course of the update:
Delete projects that are no longer used (e.g. test projects, etc.).
The author may be assigned to plans and documents by the project administrator. This it makes it possible for all participants to manage and organise a project completely independently