http://manuel.sesamath.net/index.php?page=conc Le Manuel Sésamath 5ième is a French free textbook for 2nd year High School Maths students. This underway initiative is driven by a collaborative approach which encourages contributions by Maths teachers once after they have analysed and tested the proposed topics, exercises, and material with their pupils. So far the textbook has finalised the first chapters which are freely available online and the content will be further developed and enriched on a regular basis with further contributions and comments by teachers. The site also houses other Maths related resources for High School students for free.