Biomass Utilization Superstructure (BUS) is an online tool for the evaluation of new and existing biofuels strategies. Users can modify and generate a new technology network that consists of a wide range of conversion technologies along with the corresponding feedstocks, intermediates, and final products. The optimal strategy for specific feedstocks or products can be identified through the optimization based on different objective functions (maximum profit or minimum cost). For detailed information about the optimization model, see Kim et al. (2013).Kim, J., Sen, S.M., Maravelias, C.T., 2013. An optimization-based assessment framework for biomass-to-fuel conversion strategies. Energy Environ. Sci. 6, 1093.