You will not be disappointed. Here is a list of 190 applications that can be used in the primary grades, all in the French language. The list comes from the Affluent school Board in Quebec.
http://blogues.csaffluents.qc.ca/recit/2012/11/06/le-potentiel-pedagogique-de-150-applications-ipad/
There are many apps for mathematics, some for science, creations of many kinds and for beginning readers. Many applications are free or for a small fee.