This deliverable (entitled "Data Marketplace: Software Prototype") describes the initial demonstrator of the Policy Cloud Data Marketplace. The Data Marketplace will be a unified web-based platform consisting of two (2) core services, its front-end and back-end, offering its users various ready-to-use solutions. Into this context, the current deliverable describes an overview of the Data Marketplace architecture, detailing the main features of its core components (also described in D7.4 - Data Marketplace: Design and Open Specification, delivered in August 2021), whereas all the implemented interfaces are thoroughly described accompanied by indicative examples. On top of these, the baseline technologies that have been used for the realization of the Data Marketplace are analysed, providing detailed information on how an external user can exploit and access the Marketplace.