name

1 Scitopia

2 ACM Portal

3 Emerald

4 Dialog

5 Intute

6 SciDev

7 STN International

8 Open J-gate

9 Bentham Open Access

10 Doaj

11 Oaister

12 Scirus

13 WSPC

14 LOC

15 NPTEL

16 Hindawi

17 Math World

18 InTech Open Access

19 Indian Academy of Sciences (IAS)

20 Scientific Research Pub

21 Versita Open Journals

22 Patent Searching and Invention

Url

http://www.scitopia.org/scitopia

http://portal.acm.org/portal.cfm

http://www.emeraldinsight.com

http://library.dialog.com

http://www.intute.ac.uk

http://www.scidev.net

http://www.stn-international.de

http://www.openj-gate.com

http://www.library.iisc.ernet.in

http://www.doaj.org

http://www.oaister.org/

http://www.scirus.com

http://www.worldscinet.com

http://www.loc.gov

http://nptel.iitm.ac.in

http://www.hindawi.com/

http://mathworld.wolfram.com/

http://www.intechweb.org/

http://www.ias.ac.in/

http://www.scirp.org/journal/Index.aspx

http://versitaopen.com/

http://www.freepatentsonline.com/