1)   McGill English Dictionary of Rhyme 1.1
Free software rhyming dictionary derived from the award-winning McGill English Dictionary of Rhyme, which is used by tens-of-thousands of writers, educators, students, aspiring poets and songwriters from over 100 countries.

 2)   Artefact Dictionary 1.71
Artefact Dictionary integrates into the system and allows you to get an translation of any word or expression, regardless of which application displayed it. All you need to do - is to hold 'Alt' (or some other) key and select some text by the mouse.

 3)   Zeno Systems Omnibus 1.01
Comprehensive dictionary and thesaurus housed in an easy to use package. Featuring a corpus gleaned from several sources, with very nearly 3 million cross-linked definitions, synonyms, and all manner of related terms. Free upgrades.

 4)   McGill Rhyming Dictionary & VersePERFECT 2.0
Free popular rhyming dictionary and verse editor for songwriters used by over one-hundred thousand people from over 100 countries. Created by American author Bryant McGill, Adam Markowitz, Jim Karol, Chantelle Paige, Bobbi Billard and Jeff Kozlowski.