French verse companion: real-time syllable counting (silent e, diaeresis), rhyme schemes, rhymes rated from pauvre to léonine, synonyms, rare words and definitions.
Write a world in a few lines of a code block: get its description, its stability and a living window onto it. Keep your Ages on the shelf of a floating-island refuge.
Syllable, meter and rhyme analysis for English poetry (CMUdict-based, with optional Datamuse online lookups).