Platform for education content. It consist of two parts.
Teacher can make own lesson and give access for logged pupils. They can export data from the second part of the application. Official page contains encyclopedia, articles, and questions. Materials available on the platform are free to use and modify like in wikipedia, but easier and fitted to level of skills of pupils.
Photo CC-BY-NC-SA: https://www.flickr.com/photos/herzogbr/3955153817