“Learning landscape”, and a munged together set of education tools, all free – may be worth a look. Here’s the official description:

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Started in March 2004 – Elgg is the creation of Ben Werdmuller and David Tosh. The concept behind the system is to develop a fully customizable learning landscape. To achieve this Elgg is a hybrid of weblogging, e-portfolios and social networking. It is hoped this combination of features will provide an engaging environment for learners to create their own learning space and then connect to others, forming online communities of learning.