Many trends are evolving in the field of scientific research, as electronic journals have become “the essential”. These trends include the increase of electronic journal sites, the expansion of reference linking, and the establishment of organizations that support academic societies and small publishers. Preprint servers, archiving, virtual journals, fast publishing, and alert services are also developing very rapidly. Links are created among electronic journal sites and bibliographic databases by the exchange of article metadata. J-STAGE is an electronic journal aggregator site operated by JST (Japan Science and Technology Corporation). It supports academic publishers in Japan and is discussed here in detail with examples.