The strong movement of Open Access journal is convincing many institutions to adopt an infrastructure for collecting and distributing open access journals. For this purpose, there exists popular open source software for electronic journal publishing and editorial management. Most of them are WEB based multi-language platforms capable of hosting several journals in a single press or editorial board environment. With the recent wave of Open Access and the aim of reaching critical mass, many institutions are thinking to adopt common solutions to aggregate the open access journals of multiple institutions/presses on the same infrastructure. This paper presents requirements and analysis for the development of multi-press platform, and its related implementation and validation performed expanding OJS (Open Journal System) as a multi-press and multi-journal platform. It involved a deep reengineering of the originally distributed OJS architecture. The proposed solution refers to Palamede project and that has produced the experimental portal (http://palamede.fupress.com), and which it has been validated by a test experimentation of three Italian University Presses: the Firenze University Press (FUP), the University of Parma and the Forum Editrice Press of the University of Udine.