OpenCartable is an online tool for teachers and their students organized around textbooks and bibliographies of links to Web sites or uploaded files. The "todo" links (or resources) can be affected as works that the student answers and the teacher corrects and marks. The focus is on simplicity, with students only using three pages: their desk, textbooks, and works. Users are grouped in a school, and teachers manage their students through groups. The contents are written as standard DocBook files plus a LOM (Learning Object Metadata) schema that can be shared among OpenCartable servers using simple tools like rsync.