http://www.open-immo.ch ; all Switzerland, languages:EN, DE, FR, IT

http://www.students.ch/fr/logement/ - apartments, rooms, flatshare - all Switzerland, languages DE, FR

http://www.immoogle.ch/ - all Switzerland, with map; language: DE

http://market.local.ch/en/q/?categor...Q6JeRJ2ZNVx3ow - all Switzerland, with map; languages: EN, FR, IT, DE

http://www.annonces-lyoba.ch/Immobilier/index.php - classified ads for GE, VD, VS, FR, JU, NE; language: FR - a lot of good bargains if you speak French

And last, but not the least, a very useful French-English real estate lexicon
http://www.housesearch.ch/e/renting/lexicon-french.html