Open-access literature is digital literature that is available on the web, free of charge, and free of most copyright and licensing restrictions. Committing to open access requires dispensing with the financial, technical and legal barriers that are designed to limit access to scientific research articles to paying customers.The only constraint on reproduction and distribution, and the only role for copyright in this domain, should be to give authors control over the integrity of their work and the right to be properly acknowledged and cited.
Listed below you will find a directory of some of the major Open Access collections available on the web.

Analytical Chemistry Web Resources

A compilation of resources (by Ghirma Moges) useful to support teaching and research in the field of analytical chemistry, including technical and specialized databases, encyclopedias and dictionaries, journals, university departments, organizations, societies, chemical companies and manufacturers, news sources, and much more. There is also a special section devoted to 'Chemistry in Africa' with links to educational and research materials, online textbooks, and other tools and resources for students


Ground-breaking pre-print server in selected physics, computer science, maths and neuroscience disciplines. Contains 100,000's articles submitted by members of the user community. Free access to all papers to all users.

Chemistry Preprint Server

ChemWeb's chemistry preprint server is a freely available and permanent Web archive and distribution medium for scientific research articles in the field of chemistry. It allows users to submit their articles to the server where they become accessible to all the members.

Directory of Open Access Journals

Developed by Lund University Libraries and supported by the Information Program of the Open Society Institute along with SPARC (The Scholarly Publishing and Academic Resources Coalition. The directory contains information about 350 open access journals, i.e. quality controlled scientific and scholarly electronic journals that are freely available on the web. The service will continue to grow as new journals are identified.

EEVL: The Internet Guide to Engineering, Mathematics and Computing

This portal provides quick access to the best engineering, mathematics, and computing information sources available on the Internet. Resources were selected, catalogued, classified and subject-indexed by a team of experts and information specialists

NASA Astrophysics Data System

The Astrophysics Data System (ADS) is a NASA-funded project that provides free access to over 300,000 free full-text articles in astronomy and astrophysics. Most of the major astronomical journals are included. In many cases articles published in the current year are not available through ADS. Articles are available in PDF, GIF, or other electronic formats.

New Journal of Physics

New Journal of Physics is co-owned by the Institute of Physics and Deutsche Physikalische Gesellschaft, and is supported by a growing number of physical societies around the world. NJP is available without charge to readers and is funded by article charges from authors of published papers.

Water Resources Abstracts

Compiled from several sources for USGS abstracts on the subject of water resources since 1977, plus some earlier abstracts. The method of submitting and collecting abstracts was not foolproof and, therefore, this is not a complete set. The information you find here should be augmented with other methods of search such as Water Research Abstracts

Water Research Abstracts

Collection of international water research compiled by the Water Resources Scientific Information Center (WRSIC) of the USGS. The research abstracted in this database covers a wide variety of topics; time period from 1967 to October, 1993. This database contains over 265,000 abstracts and citations. Enough information is given in each citation so that the user can locate titles of interest.