ELibM – Electronic Library of Mathematics
        Established 1996 — the longest-running and largest open access repository in mathematics.
           
    Overview
        The Electronic Library of Mathematics contains online journals, article collections, monographs, and other electronic resources in the field of  mathematics. All material is in electronic form and access is generally  free, except for some periodicals with a »moving wall«, i.e., a certain delay period after which resources become freely available.
Some requirements have to be  fullfilled for a journal or proceedings volume to be included in the  Electronic Library.