It was my Son, Ben Dalziel, who brought Scrible to my attention; it is free and, at the time of writing this, is in public beta (It went public on May 4th 2011).

Scrible's Basic Edition enables users, among other things, to...

WordsLike could be useful for learner writers that are in need of some 'new' words to "spice-up" their written work.

WordsLike is a handy website for the times learners need a thesaurus.

• Either browse the word clouds
• or simply enter a word in the search box.

Any word selected by left-clicking it in the word cloud or in the list generated by a search will result in at least one word with a similar meaning. Definitions are provided for every word on WordsLike.

Try it out at http://www...

DeeperWeb is a free search engine tool for Google users that allows navigating through search results by employing Tag Cloud techniques. 

Technologies such as Topic-Mapping methods are also  implemented to assist users in identifying relevant results upon a specific topic.

There is a tutorial available at http://www.deeperweb.com/help/tutorial-howto.php.

Visit http://www.deeperweb.com/ to try it out.