IARC-JCRR provides access to quality controlled open access journals and proceedings. It is world's largest growing professional organization for indexing of scholarly peer reviewed journals & proceedings, which boost the worldwide visibility and accessibility of your scientific content.

ResearchBib is open access with high standard indexing database for researchers and publishers. Research Bible may freely index journals, research papers, call for papers, research position.

Microsoft Academic Search is a free search engine for academic papers and resources principally in the field of computer science, developed by Microsoft Research Asia, Beijing.

WorldCat is the world's largest network of library content and services. WorldCat libraries are dedicated to providing access to their resources on the Web, where most people start their search for information.

Google Scholar is a freely accessible web search engine that indexes the full text of scholarly literature across an array of publishing formats and disciplines.

Academia.edu is a social networking website for academics. Academia.edu is a platform for academics to share research papers. The company's mission is to accelerate the world's research.

The Internet Archive offers permanent access for researchers, historians, scholars, people with disabilities, and the general public to historical collections that exist in digital format. 

GetCITED is a website database that lists publication and citation information on academic articles whose information is entered by members.

Index Copernicus (IC) is a world-wide gateway to complex scientific information. Index Copernicus’ innovative approach to the international scientific information services is integrative, interactive and inclusive.

The arXiv (arXiv.org), a project by Cornell University Library, provides open access to over a third of a million e-prints in physics, mathematics, computer science and quantitative biology.

ResearchGate is a largest network for scientists, research professionals and affiliated people to share papers, ask and answer questions, and find collaborators. It is aims to connect researchers and make it easy for them to share and access scientific output, knowledge, and expertise.

BASE is one of the world's most voluminous search engines especially for academic open access web resources. BASE is operated by Bielefeld University Library.

Citeseerx is a scientific literature digital library and search engine that focuses primarily on the literature in computer and information science. It is aims to improve the dissemination of scientific literature and to provide improvements in functionality, availability, comprehensiveness, efficiency, and timeliness in the access of scientific & scholarly knowledge.