Providing a platform as a service featuring computer software platforms for use in database management of real estate listings of properties, including properties with expired listings, for-sale-by-owner properties, non-owner occupied properties, and pre-foreclosure properties; Providing software as a service featuring software for use in managing a database of information about real estate listings of properties, including properties with expired listings, for-sale-by-owner properties, non-owner occupied properties, and pre-foreclosure properties; Providing temporary use of non-downloadable database management software