In 2017, the German federal state of Hamburg decided to fund a development plan for Open Science, greatly supporting Openness in the local research landscape. It affects three types of users: researchers, their institutions and the general public. The Hamburg State and University Library carries out a project for building a central information hub, giving citizens, researchers and the media an overview of (open) science in Hamburg and a good starting point for further exploration and research. The project focusses on three main fields of activity: (meta-)data aggregation from repositories, research data management systems, and CRISes, providing a discovery system and the creation of useful edited content for the portal. While the task of building an aggregation and discovery service is not new, the presentation of local science aimed at a local public allows for a different presentation of the scientific data. Since our project endorses openness, almost all of our sourcecode is published on Github and can freely be used by other projects.