http://www.zhongwen.com/

http://www.omniglot.com/

http://www.learnkorean.com

http://lexicorient.com/babel/arabic/

http://archives.nd.edu/latgramm.htm

http://www.onlineturkish.com/

http://etext.virginia.edu/japanese/

http://web-japan.org/kidsweb/explore/index.html