Who are Quantum23? Quantum23 is a forward thinking professional web design, web development & web marketing company based for more than 11 years in Andalucía and Gibraltar. Who are your products and services for? Our products and services are designed exclusively for businesses in the property sector (Commercial and Residential) – from independent Real Estate Agents, Rental Agents, Holiday Lettings Agents and any other property professionals. What services do you offer? We specialise in Real Estate website design, development, deployment and maintenance as well as brand collateral and marketing. Our products support inbound and outbound MLS XML feeds or those who consume feeds from other independent agents.