A project at WikiMedia with the mission:

Wikiversity is a centre for the creation and use of free learning materials and activities. Its primary priorities and goals are to:

• Create and host a range of free, multilingual learning resources, for all age groups in all languages
• Host scholarly/learning projects that complement existing Wikimedia projects (eg. a project devoted to finding good sources for Wikipedia articles)
• Host and foster research based in part on existing resources in Wikiversity and other Wikimedia projects (such as Wikibooks, Wikisource etc.)
• See more on Wikiversity/Scope and Wikiversity:Online Course. In the fulfillment of its mission, other tasks and goals may be initiated and developed by participants to support learning and the creation of new content.

Among the things I found interesting here is a list of how people can participate in this project:

Some Ideas for Effective Initial Participation

• Add or tweak some notes at a course portal. History now seeking students![1]
• Tweak a random text[2] for readability.
• Create an interesting topic portal.
• Wikiversity:Create a Random Lesson Plan
• Assemble an initial list of links useful to others interested in the topic.
• Add an outline bullet
• Add a factual paragraph or bullet to an article or its associated discussion page.
• Publish an essay question and answer or a term paper at an appropriate location.
• Write a draft quiz at an regarding a random Wikipedia article[3] or other subject of interest and publish it at an appropriate link in a learning trail.
• Take a quiz at Wikiversity:available quiz list. Grade yourself or others, if you dare.
• Publish your course notes, lesson plans, topical essays, or reference works for others to review, modify or fork.
• Come discuss how to improve Wikiversity at our current mailing list[4].

There are definitely some ideas here that I can see for eXtension.