Similar to Data Management Plans, Software Management Plans (SMPs) help researchers to manage their software based on good practices and the FAIR for Research Software principles. To do so, SMPs comprise a series of questions, including information about the software itself. A variety of SMPs exist, requiring a comparative analysis to establish a unified, up-to-date framework, tailored to the German National Research Data Infrastructures (NFDI) consortia. Following an initial comparison of current SMPs, a hackthon was held at ZB MED, focusing on harmonisation across the different SMPs, aligned to NFDI and RDMO needs. Here we present the results of this hackathon organised within the framework of the NFDI Base project DMP4NFDI. AcknowledgementsAngela Kranz is supported by DataPLANT, funded by the Deutsche Forschungsgemeinschaft (DFG), project number 442077441Marco Reidelbach is supported by MaRDI, funded by the Deutsche Forschungsgemeinschaft (DFG), project number 460135501, NFDI 29/1 “MaRDI – Mathematische Forschungsdateninitiative”.Laura Bahamón and David Walter are supported by the MAUS project, funded by the Deutsche Forschungsgemeinschaft (DFG), project number 543616919.The DMP4NFDI service is developed as a service in Base4NFDI. Base4NFDI is funded by DFG, as part of NFDI, under project number 521453681. Bernd Müller, Marisabel Ocanto, Leyla Jael Castro, and Sabine Schönau are part of the core team of DMP4NFDI.