The global Open- Source Software Input Output (OSSIO) tables were built including five different programming languages and 15 countries. The researchers used knowledge of geographical location of software developers and linkages between software projects (dependencies) to aggregate these to flows between countries. The OSSIO tables were built as part of the EU-funded research project 'Rethinking Global Supply Chains: Measurement, Impact and Policy' (RETHINK-GSC; https://rethink-gsc.eu/), which captures the impact of knowledge flows and service inputs in global supply chains (GSCs).