Grey literature is characterized as a half-published literature (is not officially published such as journals, books etc.) of limited distribution. It includes mainly research and technical reports, special institution analyses, working reports, dissertations, theses, government documents.
ArXiv is an e-print archive of documents in the fields of physics, mathematics, non-linear science, computer science, and quantitative biology.
CORDIS - Community Research and Development Information Service
Provides a broad-spectrum of the research and development information in the EU.
Digital dissertations of the Freie Universität Berlin.
Archive of digital dissertations, inaugural dissertations and theses of the Technische Universität Berlin.
Information gateway to e-prints resources in science and technology.
Czech centre of the Technical Reference Digital Library ERCIM. ETRDL is the European part of the global Networked Computer Science Technical Reference Library (NCSTRL). Searching digital collection of Czech documents, ERCIM documents and NCSTRL documents is free available.
GPO Access - A service of the U.S. Government Printing Office
Official information of the U.S. Government.
Grayfiles - Tilburg University Library
Free full texts of research and working papers on economics and mathematics of Tilburg University.
Gray Lit Network - A Science Portal of Technical Reports
Science portal of technical reports. Free documents are available via on-line interface from DTIC, DOE, NASA, EPA resources; provided by The U.S. Department of Energy (DOE) | Office of Scientific and Technical Information (OSTI).
NCSTRL - Networked Computer Science Technical Reference Library
Digital library of research and academic reports, dissertations, articles in the field of computer sciences. Searching is free available, user can download the document in selected data format.
Digital library of theses and dissertations of cooperative universities. The ETDs database - Electronic Theses and Dissertations - is free available.
The information of U.S. technical reports on science, technology and business; managed by the National Technical Information Service NTIS.
NASA server of the aerospace research technical reports. Abstracts and full texts of technical reports from the different NASA centres and programmes are free available.
NZDL - The New Zealand Digital Library
Digital library of various documents worldwide saved in the central online depositary. Including collection "Computer Science Technical Reports".
Database contains about 1,6 mil. dissertations and partially theses from U.S. and some European universities since 1861. Each record includes an abstract written by the author since 1980 and on-line facsimile of the document introduction since 1997 (24 sites). Complete full text documents are available for fee presented on the PQDD website.