Algebraic Number Theory Archive
Number theory/arithmetic geometry. (~200 articles)
Banach Space Bulletin Board
Banach spaces/functional analysis. (~400 articles, arXiv overlay)
Conservation Laws Preprint Server
Analysis/simulation of conservative PDEs. (100+ articles)
European Singularities Network
Singularities in geometry and complex analysis. Searchable index (100+ articles).
Field Arithmetic Archive
Galois theory of fields/group theory. (50- articles)
Groups, Representations, and Cohomology Preprint A
Algebraic topology/finite group theory. (100s of articles.)
Hopf Topology Archive
Algebraic topology and related areas. (~400 articles)
Jordan Theory Preprint Archives
Jordan algebras and related topics (~100 articles).
K-theory Preprint Archive
K-theory (generalized cohomology theories). (~400 articles)
Linear Algebraic Groups and Related Structures
Including Azumaya Algebras, Algebras with Involutions, Brauer Groups, Quadratic and Hermitean Forms, Witt Rings, Lie and Jordan Algebras, Homogeneous Varieties. DVI, PS, PDF (~80 items).
Markov Chain Monte Carlo Preprint Service
A list of all registered papers on MCMC methodology currently submitted for publication. Based at the Statistical Laboratory of the University of Cambridge.
Mathematical Physics Archive
Also called mp_arc; at UT Austin. (2000- articles)
MGNet Preprints
Multigrid and other methods for PDE simulation. (100+ articles)
Optimization Online
A repository of eprints about optimisation and related topics.
Probability Abstract Service
Probability Abstract Letters are sent about once every two months. The subscription is free.
Shelah's Archive
Papers by Saharon Shelah in logic and related. (100s of articles, arXiv mirrored)
Topology Atlas Preprints
Mostly general topology. (400+ articles)