What is the most accurate online tool/program for translation?

I'm recommending some Translation sites .

These sites do not  based on literal Translation like Google but based on a Semantic Translation .

http://www.freetranslation.com/

http://translation2.paralink.com/

http://www.babelfish.com/

http://www.worldlingo.com/

http://www.wordreference.com/

http://www.reverso.net/text_translation.aspx?lang=EN 

Good Luck .

I prefer Google always