With TIB Open Publishing, the Technische Informationsbibliothek (TIB) – Leibniz Information Centre for Science and Technology – is about to launch a new open-access service on which scientific journals and conference publications can be published. In doing so, it is underlining its orientation towards open science and adding a significant new pillar to its activities to support the transition to open access. As a research partner, TIB is committed to professional, optimally accessible, and widely visible publications. The service is aimed at editors of scientific journals and conference publications who want a library-supported, non-commercial, but at the same time sophisticated, sustainable, and completely open access publication option. Our service is aimed at existing conference publications and journals as well as at new launches and it is open to all scientific disciplines. The scientists who act as editors and reviewers of the individual publications are responsible for the quality assurance of the content of the published articles. On the part of TIB Open Publishing, however, we ensure that formal quality standards are met by the hosted publications. There must be compatibility with the funding criteria („Plan S“) of the research funding agencies that are members of the cOAlition S. Our quality standards are therefore based on the technical implementation guidelines of Plan S, but also on the DOAJ Seal, the OASPA membership criteria, and the COPE guidelines. Our technical services encompass the hosting of journals and conference publications and the distribution of metadata and content to indexing, archiving, and registration systems. We offer a continuously enhanced XML-based publication workflow and engage especially with the OJS developer community in Germany, Austria, and Switzerland. We also develop OJS plugins for community use.