RNPLS&T’s experience in providing open access and developing open archives is discussed. RNPLS&T’s heterogeneous information resources are evaluated; the structure of the inhouse digital resources in 2018 is described, including digitized books in RNPLS&T’s Electronic Archive, employees’ articles, articles in journals published by the Library, articles in the Library conferences proceedings, all hosted by the E-library, and the RNPLS&T’s information systems. The technologies of access to RNPLS&T’s digital resources are characterized, including in-house and commercial ones: access with Summon federated search system, access using Z39.50 and SRU/SRW protocols and access via the National Electronic Library access to the RNPLS&T’s resources, access to RNPLS&Ts E-library metadata using OAI-PMH protocol, etc. Integrated search external services are described. The technology of remote users access to individual subscriptions and licensed databases is specified. The current state of software solutions for server modules of the RNPLS&T’s open archive based on IRBIS64+ ILS is characterized.The goal is to provide users with the extended set of instruments for information retrieval and access to demanded full-text publications, including the external ones.