Poet Assistant! It's a dictionary app that offers:
• a rhyming dictionary, using the Carnegie Mellon University pronunciation dictionary.
• a thesaurus, using the WordNet thesaurus.
• a dictionary, using the WordNet dictionary.
• a screen where you can enter your poem text, and have it read aloud back to you by the device's text-to-speech engine.
Poet Assistant works offline, without any internet connection.