Hypertext Bibliography Project - http://liinwww.ira.uka.de/bibliography/Misc/HBP/ Search enabled database of citations for a large selection of computer science specialties. Authors may add bibliographic lists or contextual references to their work.
Bibliographies on Mathematics - http://liinwww.ira.uka.de/bibliography/Math/index.html Search enabled database of citations for a large selection of mathematical specialties. Authors may add bibliographic lists or contextual references to their work.
MathNet/MPRESS - http://mathnet.preprints.org/ Mathematics preprint search engine. Includes some European servers not covered elsewhere.
Directory of Open Access Journals - http://www.doaj.org/ Covers many free full-text mathematics and scientific journals (most are peer reviewed).
Project Euclid - http://projecteuclid.org/ Full text access to the journal Annals of Mathematics; a limited number of other journals available through paid subscriptions to Project Euclid.
CiteSeer.ist - http://citeseer.ist.psu.edu/ E-print database of mathematics and science papers with citation information. Papers may be added by specifying the URL where their files reside.
Front for the LANL ArXiv - http://front.math.ucdavis.edu/ Easiest search access to papers posted on the preeminent Los Alamos National Lab (LANL) Physics and Mathematics preprint server (arXiv).
E-print Network - http://www.osti.gov/epsearch/ U.S. Department of Energy's search interface. Many options for fine tuning a search.
Citebase Search - http://www.citebase.org/search Experimental demonstration of the Open Citation Project. Search citations by paper or author.
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