The open-source and open-access SlideWiki platform employs crowdsourcing methods in order to support the authoring, sharing, reusing and remixing of open courseware. The SlideWiki project is introducing the SlideWiki platform to different communities of educators and learners by performing a wide range of trials covering different levels of education (i.e. from secondary to higher education) and different types of learning (i.e. formal learning, informal learning, vocational learning). Each of these large-scale trials is carried out with hundreds of educators and thousands of learners in different countries across Europe.