Library

Open Access

Gateway/Directory

Scirus :for scientific information only
Open Access Journals Search Engine (OAJSE)
OAIster : Union catalog of millions of records representing open access resources
Google Scholar
WorldWideScience.org is a global science gateway
DOAR : Directory of Open Access repository
DOAJ : Directory of Open access journal
DOAB : Directory of Open Access Books
Open JGate : Open Acees journal gateway

ETD (Electronic theses and dissertations)

Networked Digital Library of Theses and Dissertations (NDLTD),a single point access to ETDs of major participating institutions worldwide.
Alldissertations.com:Collection of dissertations and theses from the universities all over the world.
EThOS :"single point of access" to ALL theses produced by UK Higher Education.
DART-Europe E-theses Portal:open access research theses from 407 Universities sourced from 20 European countries.
Vidyanidhi – Digital Library and E-Scholarship Portal Indian ETD Collection
Shodhganga@INFLIBNET Centre : Ph.D. theses of Indian Universities
DiVA Academic Archive On-line :30 Universities and colleges of Higher education

Digital Books/ Libraries

arXiv :Physics, Mathematics, Computer Science, Quantitative Biology, Quantitative Finance and Statistics
CiteSeerX : Computer Science
InTechOpen :free E-books and Journals in science and technology
Digital library of India
Digital Book Index :Millions of e-books across the world

Major Open Access Journals