Manufacturing in Europe should urgently address the following challenges towards the adoption of the Manufacturing as a Service paradigm: product customisation, circularity and sustainability, minimal downtime, predictive maintenance, seamless communication, reliability and robustness to uncertainties in demand and variability of resources, and cost reduction and performance optimisation. Unified Modeling and Automated Scheduling for Manufacturing as a Service (UniMaaS) project will develop a platform with a set of advanced technologies for offering flexible and decentralized manufacturing resources and supply chains as a Service to European SMEs and Industries. To realize this vision, the proposed platform will deploy 3 integrated Suites: (i) Data Modelling Suite: offering manufacturing dataspaces, cloud-based resource monitoring, trusted cross-company data exchange and digital product passport, (ii) Modelling Suite: offering modular modeling of manufacturing resources, intent-based servitization , AI-based estimations and Zero-X analysis, and (iii) Decision-Making Suite: offering scheduling and planning of manufacturing resources, circularity and sustainability optimization. The platform will adopt advanced digital technologies such as cloud computing, digital twins and trustworthy AI, as key enablers towards fulfilling its objectives. UniMaaS platform will provide easy access to customized manufacturing service chain and will support the entire life-cycle management of processes and products. The UniMaaS Suites and the Platform will be demonstrated in 4 Pilots including aircraft maintenance, automotive seating, 3D construction printing and logistics/warehouse management.