(Australia) Institute for Geometry and its Applications, Adelaide: Preprint archive with postscript downloads from 1996 - present.
(Austria) ESI: Erwin Schrodinger Institute, Vienna, Austria.
(Belgium) Katholieke Universiteit Leuven: Numerical Analysis, Applied Mathematics and Computer Science Publications.
(Belgium) Limburgs Universitair Centrum: Algebra group preprint archive.
(Belgium) University of Louvain: Searchable preprint archive.
(Canada) CECM: Centre for Experimental and Constructive Mathematics preprint service.
(Canada) CRM Montreal: Technical reports of the Centre de Recherches Mathématiques, Montreal, Canada.
(Czech Republic) KAM/DIMATIA: Prepublication medium for Department of Applied Mathematics (KAM), Charles University, Prague. (400 items)
(Czech Republic) KMA: Department of Mathematical Analysis, Charles University.
(Denmark) IMADA Odense: Department of Mathematics and Computer Science, University of Southern Denmark/Odense University.
(Denmark) MaPhySto, Aarhus: Center for Mathematical Physics and Stochastics.
(Denmark) University of Aarhus: Department of Mathematical Sciences. Preprints, working papers, lecture notes, memoirs and theses.
(France) CAMS: Centre d'Analyse et de Mathématique Sociales, EHESS, Paris, France.
(France) IHES: L'Institut des Hautes Etudes Scientifiques, Bures-sur-Yvette, France.
(France) INRIA: National institute for research in computer science and control. Research reports, technical reports, theses.
(France) Institut Elie Cartan, Nancy: Preprints. Abstracts; papers in PS format.
(France) IRMA Strasbourg: Institut de Recherche Mathématique Avancée, University of Strasbourg.
(Germany) Albert-Ludwigs-Universität Freiburg: Mathematics Faculty preprints from 1995.
(Germany) FU Berlin: Math Department, Free University of Berlin, Germany.
(Germany) Humboldt Universität, Berlin: Mathematics Institutes, Humboldt University, Berlin, Germany.
(Germany) KANT Group: Technical University of Berlin.
(Germany) Kiel University: Mathematics Seminar Reports.
(Germany) Konrad-Zuse Center for Scientific Computation, Berlin: Preprints and technical reports from 1986, indexed by year.
(Germany) Magdeburg University: Faculty of Mathematics preprints and technical reports by year from 1994, searchable.
(Germany) MPIM Bonn: Max Planck Institute for Mathematics.
(Germany) Muenster: SFB 478: Geometrische Strukturen in der Mathematik. German/English.
(Germany) TU Berlin: Sfb 288: Differential Geometry and Quantum Physics.
(Germany) TU Darmstadt: Department of Mathematics, Darmstadt University of Technology.
(Germany) Universität Halle-Wittenberg: Department of Mathematics and Computer Science, Martin-Luther-Universität Halle-Wittenberg.
(Germany) University of Bielefeld: Diskrete Strukturen in der Mathematik preprints from 1989. Compressed PostScript.
(Germany) University of Rostock: Preprints from 1993 to the present.
(Germany) University of Ulm: Faculty of Mathematics and Economics, Department of Stochastics. Publications from 1995.
(Hungary) Alfréd Rényi Institute, Budapest: Preprints by author.
(India) Tata Institute of Fundamental Research: School of Maths preprint server. Indexed by author: DVI/PS.
(Italy) ICTP: Preprints issued at the Abdus Salam International Centre for Theoretical Physics, Trieste, Italy. Searchable.
(Italy) INFN Rome: Mathematical Physics, Roma La Sapienza, Rome.
(Italy) Pisa: Calculus of variations and geometric measure theory papers from 1995.
(Japan) Kyoto University Department of Mathematics: Searchable preprint collection from 1993.
(Netherlands) CWI Amsterdam: Research reports, journals, monographs and proceedings.
(Netherlands) CWI Amsterdam: Technical Reports available by FTP in compressed PostScript, listed by subject and date.
(Netherlands) Universiteit van Amsterdam: Korteweg-de Vries Institute Mathematical Preprint Series. ArXiv overlay.
(Norway) NTNU Trondheim: Preprint Series, Department of Mathematical Sciences, Norwegian University of Science and Technology, Trondheim.
(Russia) St. Petersburg Mathematical Society: Preprint collection open to members of the Society. TeX and/or PostScript format.
(Spain) CRM Barcelona: Publications of the Centre de Recerca Matemàtica, Barcelona.
(Turkey) Middle East Technical University: Department of Mathematics preprint archive.
(UK) BRIMS: Archive of Technical Reports of the Basic Research Institute in the Mathematical Sciences, Bristol; closed 2001.
(UK) Isaac Newton Institute, Cambridge: Books arising from Institute Programmes.
(UK) Isaac Newton Institute, Cambridge: Mathematical Sciences preprints.
(UK) South Bank University: Computing, Information Systems and Mathematics Technical Reports from 1993.
(UK) University of Bath: Mathematics Group preprints by year from 1993.
(UK) University of Bristol: Applied Nonlinear Mathematics, Faculty of Engineering.
(UK) University of Cambridge: Statistical Laboratory Research Reports.
(UK) University of Cambridge: Department of Applied Mathematics and Theoretical Physics searchable preprint database.
(UK) University of Durham: Geometry and arithmetic preprints.
(UK) University of Glasgow: Preprint archive from 1995.
(UK) University of Leicester: Mathematics and computer science technical reports from 1995.
(UK) University of Oxford: Mathematical Institute. Searchable index.
(UK) University of Southampton: Pure Mathematics Group Preprints from 1995.
(USA) American Institute of Mathematics: Mainly in number theory. From 1998, PS and PDF.
(USA) Argonne National Laboratory, Math and Computer Science Division: Technical report anonymous ftp area. Most documents are available in compressed dvi or compressed postscript.
(USA) CNA: Center for Nonlinear Analysis, Carnegie-Mellon University, Pittsburgh, PA.
(USA) DIMACS: Center for Discrete Mathematics and Theoretical Computer Science, Rutgers, New Jersey.
(USA) Duke University: Mathematics Department, Duke University, Durham, NC.
(USA) Florida State University: Math Department, Florida State University, Tallahassee, FL.
(USA) GANG Document Library: Center for Geometry, Analysis, Numerics and Graphics. Organised by date, author.
(USA) Geometry Center, UIUC: Research papers, conference proceedings, expository and educational articles.
(USA) George Washington University: Math Department, George Washington University, Washington, DC. 1999 onwards, mainly PDF.
(USA) IMA: Institute for Mathematics and its Applications, Minneapolis, MN.
(USA) IMI South Carolina: Industrial Mathematics Institute, University of South Carolina, Columbia, SC.
(USA) IMS Stony Brook: Institute for Mathematical Sciences Preprint Server, SUNY Stony Brook, NY. ArXiv mirrored.
(USA) Institute for Scientific Computation, Texas: Technical Report Series from 1994.
(USA) Louisiana State University: Math Department, Baton Rouge, LA.
(USA) MSRI: Mathematical Sciences Research Institute, Berkeley, CA.
(USA) Oklahoma State University: Math Department, Stillwater, OK; ArXiv overlay.
(USA) RUTCOR: Research Reports from 1993 in PS or PDF.
(USA) Temple University: Department of Mathematics Research Reports from 1991.
(USA) UC Davis: Math Department, University of California, Davis, CA; ArXiv overlay.
(USA) UC Santa Barbara: Math Department, University of California, Santa Barbara, CA.
(USA) UCLA: Math Department, University of California, Los Angeles, CA.
(USA) UIUC: Department of Mathematics, University of Illinois, Urbana-Champaign, IL. Faculty publications in HTML/PDF.
(USA) University of Kentucky: Department of Mathematics, Lexington, KY.
(USA) UT Austin: Math Department, University of Texas, Austin, TX.
(Vietnam) Hanoi Institute of Mathematics: E-preprints archive for year 1998. Abstracts, text in PostScript.
D-MathNet.Preprints: Searchable index to mathematics preprints in Germany.
German Mathematics Departments Serving Preprints: A sensitive map.
Joint Austrian/Bavarian Publications Broker: Searchable collections in mathematics and statistics.