A national network of open access repositories increases the visibility and impact of national research activities and enables faster knowledge transfer and exploitation of research results. It provides additional services for users such as federated search across all involved repositories and permanent storage of research publications and research data. The presentation will discuss organisational and technical aspects of establishing a Slovenian open access infrastructure. The infrastructure consists of Slovenian universities’ repositories, a repository for research organisations and a national portal that aggregates content from the repositories and other Slovenian archives (dLib.si, VideoLectures.NET, digital library of Ministry of Defence, Social Science data archive and ScieVie repository). The national portal ‘openscience.si’ provides a common search engine, recommendations for similar publications, and similar text detection. The main advantages of the Slovenian infrastructure by comparison with other well-known European national open access infrastructures are: the use of software for plagiarism detection during the process of submitting electronic theses, dissertations and research publications; the use of a central recommender system within the national portal that provides recommendations across all repositories; the integration of universities’ repositories with their information and authentication systems, i.e. with the ARNES authentication and authorisation infrastructure (AAI), the national bibliographic catalogue COBISS.SI, the national current research information system SICRIS and the national portal; the availability of repositories from mobile applications for Android, Windows Phone, and iOS devices; and the usage of new features regarding repositories that have not been used within other well-known open source repository software (Dspace, Eprints, Fedora…). These features are mentor statistics, automatic document segmentation and the normalisation of authors using the CONOR.SI normative database. As part of the setting up of the national open access infrastructure, rules and processes for the mandatory submission of electronic theses, dissertations, research publications and research data were defined. A Linked Open Data (LOD) OpenScience.si dataset is available in order to promote and facilitate the reuse of metadata by other libraries and communities. Milan Ojsteršek received a PhD in Computer Science from the University of Maribor in 1994. He is Head of the Laboratory for Heterogeneous Computer Systems in the Faculty of Electrical Engineering and Computer Science, University of Maribor. His research focuses on heterogeneous computing systems, digital libraries, the semantic web, and service-oriented architecture.