Common to all subjects

• http://www.wikipedia.org

Chemistry:

• http://www.chemistry.org/portal/Chemistry
• http://www.chemweb.com
• http://www.chem4kids.com
• http://www.ill.fr
• http://www.chemistry.mcmaster.ca

Physics:

• http://www.physicsclassroom.com
• http://www.physics.about.com
• http://www.physicsforums.com
• http://www.tcaep.co.uk

Biology:

• http://www.ucmp.berkeley.edu/bacteria/cyanointro.html
• http://www.wildlifeindia.com
• http://www.ehc.com/vbody.asp
• http://www.biology4kids.com
• http://www.biology-online.org

Mathematics:

• http://www.mathgoodies.com
• http://www.coolmath.com
• http://www.cut-the-knot.org
• http://www.math.com
• http://www.mathsisfun.com
• http://www.nctm.com
• http://www.sosmath.com
• http://www.mathforum.com
• http://www.math.niu.edu

Social Studies:

• http://www.photovault.com
• http://www.digital-librarian.com/history.html
• http://www.bbc.co.uk/history

Malayalam:

• http://www.sahitya-akademi.org
• http://www.malayalabhasha.com
• http://www.malayalavedhi.com

English:

• http://www.dailygrammer.com
• http://www.dict.org
• http://www.dictionary.cambridge.org/cmd_search.asp
• http://www.oup-usa.org/reference/dictionaries/english.htm/

Hindi:

• http://www.ukindia.com/zhin001.htm
• http://www.hindi.nic.in