This directory contains reference copies of some other open source packages we sometimes depend on. The purpose is solely to make sure that one version stays available in a known URL, and therefore that we don't annoy a customer by referring them to a site that just moved. Python Mega Widgets: these are graphical widgets used by our Drawing Editor. These will be needed if you want to visually configure charts. The canonical location for this is http://pmw.sourceforge.net/ Python Imaging Library: this is a very mature package in Python and C for handling bitmap image formats. If you want to use bitmaps in PDF documents, or save drawings to bitmap formats, you need this. PIL will add a package "PIL" to your path, and to install a C extension "_imaging" directly on the path. The canoncial location for PIL is http://www.pythonware.com/