HOPU (HOP Ubiquitous; also known as Libelium Lab) is a software company that specializes in the internet of things (IoT) solutions and smart cities. It develops and deploys smart city applications, helping urban areas become more efficient through technology in areas such as traffic management, environmental monitoring, and public safety. HOPU also provides solutions for monitoring environmental parameters, such as air quality, noise levels, and pollution, helping organizations and governments track and improve environmental conditions.