The document summarizes the work of the CoLearn research community which investigates how OpenLearn tools can support informal and collaborative learning. It presents examples of uses of different OpenLearn tools including Compendium maps, FlashMeeting webconferences, FlashVlog videos, and Moodle by various researchers to engage learners, promote participation and meaningful learning, and help learners organize and construct knowledge. The tools show potential to facilitate multimedia, collaborative knowledge building and sharing within learning communities.