Marine renewable energy (MRE) devices, such as offshore wind turbines, wave energy converters and tidal energy converters, are usually in the form of floating types and anchored by mooring systems. To analyze the feasibility of these floating systems in an efficient manner with respect to a wide band of frequency, frequency domain methods are good options to choose. In the present work, we developed an efficient software package for evaluating the performance of floating renewable energy systems in the coastal and offshore regions. It aims to contribute
an open-source effort to numerical simulations for ocean energy converters. The interface and structure of the software package are introduced in detail so as to let it be well understandable by the readers. Computations of a benchmark geometry and two practical applications of floating wind turbine are conducted and compared with theoretical results, experimental data and results from commercial software Hydrostar, justifying the effectiveness of the developed software package.