This article is based on a paper presented at the Tenth International Conference on Grey Literature (GL10) in which GreyNet's collections of conference preprints were made accessible via the OpenSIGLE Repository. OpenSIGLE offers a unique distribution channel for European grey literature with roots dating back a quarter century. The experience of INIST as service provider and GreyNet as data provider will be further discussed including recent developments. The poster closes with a draft proposal that seeks to explore the capacity required for the OpenSIGLE Repository to develop in multilateral and international cooperation in support of European research infrastructures committed to the open access of grey literature collections and resources. Emphasis is placed on the involvement of libraries, research centers, and institutions of higher education, as well as, requirements for a grey literature network service to sustain further development, exploitation, and promotion of the OpenSIGLE Repository.