Providing a website, computer software platform and mobile applications featuring non-downloadable computer software in the field of residential real estate for connecting sellers and buyers of residential real estate; Providing a website and computer software platform featuring non-downloadable computer software that enables buyers and sellers of residential real estate to access real estate property information; Platform as a service (PAAS) featuring computer software platforms for facilitating off-market residential real estate transactions, verification of sellers, validation of properties, certification of buyers, and connecting verified sellers and validated properties with certified buyers