This one has same sounding words etc. –> http://www.fonetiks.org/

This is a grammar guide – the one I like best anyway, because its in alphabetical order. If you want to learn grammer, it might not be so good, but if you want to use it as reference, this is a good place. Includes author comments and opinions as well. Very informative. –> http://andromeda.rutgers.edu/~jlynch/Writing/contents.html

This is an English Test site –> http://www.english-test.net/

This is a cool one that has lots of reference for different things to do with English, including idioms –> http://www.usingenglish.com/reference.html

This is a straightforward dictionary –> http://dictionary.reference.com/

There’s a lot more in that genre, some with other info as well, like Wikipedia and the like. Here’s a partial list:

http://www.onelook.com/

http://www.m-w.com/

http://www.learn-all.com/index.php?fetch=languages/english

http://dictionary.cambridge.org/

THIS one is has free online English “classes” –> http://www.english-class.eu/?gclid=CKG516nG4I4CFRpkYQod5gmGUA

Good Luck!