A great site, dedicated to learning and totally free for teachers, students and families.
Their slogan is :"Where the learning community meets"
As they say :" Tiching gives you access to 80.158 learning contents via its search engine. If you sign up, you can also enjoy lots of other opportunities: meeting new people, comment on contents, get recommendations..." It is also available in Spanish, Catalan, Basque and Galician. Click here to go to Tiching