Can anyone tell me some good free sites to post houses/condos/apartments etc. for sale/rent?

Please only post free websites. Also if anyone knows of any greater Sacramento area websites, that would be great

What websites can I search for houses, rental houses, condos/townhouses, apartments, etc. for on sale?

My family will be moving to a city within 30 mins of Zion, IL, and I would like to know what websites I can search for housing on sale. Thanks in advance.