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. The Electronic Library of Mathematics is supervised by the Electronic Publishing Committee of the European Mathematical Society (EPC-EMS). Some requirements have to be fullfilled for a journal or proceedings volume to be included in the Electronic Library.

Source: http://www.emis.de/ELibEMS.html