The European Open Science Cloud (EOSC) initiative already has a high impact on structured access to Open Data and with the current funding by the European Commission of implementation projects, the interdisciplinary exploitation of data can only improve. The future EOSC is shaped along action lines that are detailed in close collaboration between the EOSC governance boards and ESFRI. EOSCsecretariat.eu is undertaking pooling of stakeholder views on the implementation of EOSC. This document presents a collection of five position papers from ESFRI cluster projects. The ESFRI cluster projects were launched in 2019 in order to implement interfaces to integrate computer and data management solutions, to create cross-border and open cooperation spaces and to promote clouds via the EOSC portal for a larger user community.