English

http://www.1-language.com/

http://www.manythings.org/fq/ interactive quizzes

http://www.manythings.org/wbg/ flash games

http://easyworldofenglish.com/ with audios

http://www.abcya.com/ games

http://www.languageguide.org/english/vocabulary/ for vocabulary

https://in.ixl.com/ela/class-xi up to higher secondary level interactive lessons

http://www.abaenglish.com/

http://www.englishpage.com/games/games.html with games

http://www.englishspeak.com/english-lessons.cfm  conversation with audio (Spoken English)

http://en.bab.la/ dictionary games etc..

http://www.real-english.com/reo/1/1-3.htm exercise

https://www.englishgrammar.org/exercises/

http://www.grammarcheck.net/editor/ for grammar checking

http://www.englishgrammarsecrets.com/

https://www.usingenglish.com/teachers/  for teachers handouts, lesson plans, vocabulary, quizzes …

http://www.uen.org/k12educator/uenresources.php?cat=English+Language+Arts

https://www.englishclub.com/teach-english.htm

http://www.english-test.net/

http://www.britishcouncil.org/kids-games-paint-rainbow.htm

http://a4esl.org  (quizzes)

http://funeasyenglish.com  (video lessons)

http://www.busuu.com  (Interactive)

http://www.vocabsushi.com  

http://www.examenglish.com/grammar/  (for Competitive exams)

http://www.abcya.com/kindergarten_computers.htm#letters-cat  (for Kids)

http://www.languageguide.org/english/  (for Kids)

http://www.learnenglish.de/

http://www.google.de/language_tools?hl=en  (Translation tool)

http://www.bbc.co.uk/worldservice/learningenglish/

http://eslblogs.englishclub.com/ (Text) 

http://www.english-at-home.com (Text) 

http://esl.about.com/library/beginnercourse/

Tamil to Spoken English

https://www.talkenglish.com/

http://www.aangilam.org/

https://www.english-tamil.net/learn-3000-plus-common-words.php?page=1&topic=A