List of Open Access Resources

The following are the major Open Access Directories & Databases for Science.

National Digital Library of India
SciELO
Science.gov
POLS 
Scigine
F1000 Research is an Open Science
SSRN Social Science Research Network
Journals for Free
DOAJ 

http://nopr.niscair.res.in/
http://www.vidyanidhi.org.in/
http://www.opendoar.org/
http://roar.eprints.org/
http://nsdl.org/resources_for/librarians/?pager=resources
http://www.icaap.org/http://journal.ignouonline.ac.in/iojp/index.php/IJOL/index

Tamil E-Resources:
www.tamilheritage.org/uk/bl_thf.html
http://tamilelibrary.org
http://pm.tamil.net
www.chennailibrary.com