Adult learning und diplomas:
Swiss adult learning information center ALICE
D.E.L.E. certificates
Swiss education council
Swiss education internet portal (Ausbildung-Weiterbildung.ch)
Common European Framework of Reference for Languages 

Online diccionaries and encyclopedias:
Diccionary de la Real Academia Española
Diccionary of synonyms and antonyms
Wikilengua Spanish
Wikipedia Spanish

Excercises:
Virtual activities (Aveteca)
Audio magazine of the magazine Punto y Coma

Travel:
Argentina travel (Argentinienreisen individuell organisiert)
Chile travel (Chilereisen individuell oder in Gruppe)