The UKB-programme Strengthening Diamond Open Access in the Netherlands (2024 - 2026) helps advance not-for-profit journals and publishers. The demo displays the online Expertisecentre which launched last january, which will provide tailor cut information on diamond open access publishing for authors, editorial boards and university presses, along with preliminary results from our analysis of the Dutch diamond journal landscape. We'll also present our plans for establishing a shared technical infrastructure that will be made available to all university presses, research institutes, and other academic organisations that wish to develop and publish their own articles, journals and (text)books.