Moment I came across this great resource I was enthralled. It is unique, it is excellent and it is free.
Visuwords™ is an online graphical dictionary where you can enter the words to find their meanings and their associations. When you enter your search word, its meaning and association open up into various connected multicolored nodes.
You can hover over each node to find the definitions.
It is just not a dictionary, It is a thesaurus. It maps the words for you.
A great tool for writers.
Check it out.
Popularity: 7% [?]
Tags: graphical dictionary, onlineresources, thesaurus, visuwords

Thanks for the great tool! I sometimes use it.
But as for languages, I prefer online tools, like google translator and thesaurus dictionary.