arXiv.org is a fully automated electronic archive and distribution server for research papers, covering physics and the related disciplines of mathematics, nonlinear sciences, and computer science. Based on arXiv.org, Eprintweb.org is a service from the Instiutue of Physics. It can be searched, browsed, and personalized. Althought it is free, registration is required for personalization.
ASDL is a digital library that collects, catalogs, and publishes peer-reviewed educational resources in the analytical sciences. ASDL can be browsed by techniques, applications, format, and teaching resources, or the entire digital library can be searched.
Part of ICPCNanoNet, Nano Archive is a fully automated electronic archive for nanoscience and nanotechnology. Researchers can freely deposit full text papers. The archive can be browsed by year, subject, or author, and there is a search engine.
Arranged by institution, the Virtual Technical Reports Center links to full text reprints, preprints, e-prints, and technical reports as well as theses, disserations, and research reports from around the world.