Excellent post today from Kris Berg about the varied places one can search for homes. Frequently even my savvy home buyers are surprised that not all homes are listed in the MLS. Kris does an extraordinary job pulling them all into on place.
Locally, I am directing my buyer clients to search not only search the local MLS
Update July 2020
There are more sites, but these are the most popular.
My value is in the representation I offer to my clients, not in searching websites.