This paper presents findings of the Horizon Europe project OPTIWISE, which focuses on developing innovative design methods for ships equipped with wind-assisted propulsion. The project encompasses comprehensive evaluations, including environmental, economic, and business impacts. Three distinct design cases are explored: a bulk carrier using Rotor Sails, a tanker fitted with Oceanwings, and a passenger vessel with Solid Sails. The wind-assisted propulsion systems are detailed, along with the design and evaluation methodologies employed. Rotor Sails harness the renewable power of wind through the Magnus effect, significantly reducing fuel consumption and emissions. Oceanwings provide additional thrust to vessels. Solid Sails, a modern take on traditional sails, are constructed using advanced materials and have versatile applications. OPTIWISE also introduces innovative design and evaluation methods that consider the holistic impact of wind propulsion on ship design. The need for a more integrated approach is emphasized, where all relevant subsystems are evaluated and optimized together, considering the full operational conditions. As the shipping industry journeys towards sustainability, wind-assisted propulsion systems offer a promising solution. OPTIWISE’s insights and methodologies contribute to the adoption of these innovative technologies, fostering a greener and more efficient future for maritime transport.