This document summarizes the work of Slim Turki and Prune Gautier on open data and data ecosystems since 2012. It discusses their projects on open data quality, how open data is turned into services, and data ecosystem governance. It also outlines recommendations for establishing sustainable data ecosystems, including collaborative governance, stakeholder engagement, technical standards, and economic sustainability. Finally, it notes trends moving from open data provision to ecosystem thinking with high value datasets, the European Data Strategy, and opportunities around health, environment, and urban digital twins data.