For school education
https://www.bbc.co.uk/bitesize
https://www.abcya.com/ (educational games)
http://sweatmaths.edublogs.org/ for Indian school education in Tamil
http://www.neok12.com/ (Commercial website)
http://freeology.com/ worksheets coloring sheets,
https://www.spreeder.com/app.php English reading practice
http://www.pulsecommunity.org/ for life sciences
http://www.best-flash-games.net/ free flash games
http://www.proprofs.com for flash card, quiz creation and free online games
http://www.sciencenetlinks.com/ interactive animated lesson
http://www.learnalberta.ca/Home.aspx
https://sciencebob.com/ science
www.animaldiversity.org/ Zoology
http://www.cellsalive.com/ cell biology
http://www.toporopa.eu/en/ for geography education
http://www.flashcardexchange.com for flash cards
https://www.abpischools.org.uk/ education with interactive simulation
http://unplugthetv.com/ useful videos
http://www.pallikalvi.in/Teachers/Teaching%20Resources.htm for school material (TN Govt.)
http://illuminations.nctm.org/ http://www.pil-network.com/ for Indian school education by Microsoft
http://freeology.com/ worksheets coloring sheets,
https://www.youtube.com/channel/UCCBOAJlaQigsxfqHCLRIjOQ/featured for Indian school