Is it possible to install KanBo without SharePoint?

Is it possible to install KanBo without SharePoint?

The situation is as follows. KanBo must store documents (which are located in KanBo cards) somewhere.

We have discovered the SharePoint Foundation, which is a service that must be activated while configuring of the Windows server. You do not need CALs, because they are already contained in the Windows operating system of the clients. The server license is included in the Windows server. KanBo users can never get to the SharePoint Foundation because KanBo uses the SharePoint Foundation as a document repository with all features like versioning, integration with local office programs, search, editing in the browser.