There are some simple tools and tests that I've made with Processing, RiTa, WordNet and general english grammar. I'll upload some of them here.
Most of them need to have WordNet (for Windows in my case) installed at an obvious place specified in the setup.

I keep those here for myself as generic templates but I think other people could also want to use it.

Synonymous sentence

This one replaces every word of a string with one of its synonym and prints the result, and recursively processes the result in an oulipoesque way.
synonymSentence01.zip

This parts.xml is intriguing and was made to be used with this sketch (that also uses some file distributed with rita) to generate random poems, it uses example words and lacks actual content though.

This unfinished doc where I try to define possible substitutes in english is also interesting.