E-Math. Global Directory of Preprint and e-Print Servers.

List the current homepage URLs and email contacts of all mathematical preprint and e-print servers throughout the world. The servers are divided into three categories: umbrella servers which cover all areas of mathematics such as the Mathematics section of the Los Alamos (Ginsparg) e-Print Archive and the MPRESS/MathNet.preprints server, special subject servers and servers administered by mathematics departments and institutes. There is an additional link to retired preprint services.

Florida State University Department of Mathematics. F.S.U. Math e-Print Archive 

MathNet.preprints

Searchable index of preprints from Austria, France, Germany, LANL and more.

Los Alamos National Laboratory Physics Preprint Server

Supported by the U.S. National Science Foundation  with the Los Alamos National Laboratory, and by the U.S. Department of Energy in collaboration with local support from the National Institute for Theoretical Physics, the University of Adelaide Library and the Department of Physics and Mathematical Physics at the University of Adelaide .

Mathematical Physics Preprint Archive   mp_arc.

An electronic archive for research papers in Mathematical Physics and related areas.