I wish I had had Rhyme & Reason back when I
was actually writing poetry. From the FAQ:
Rhyme & Reason is a suite of online tools for poets and lyricists. It
includes an editor for writing verse, an integrated dictionary, rhyming
dictionary and thesaurus for finding words, metrical scanning tools for
identifying meter and rhyme scheme, as well as features that allow you
to share your work with others and comment on other writers' poems or
lyrics.
Now I don't really give a damn about rhyming dictionaries and
thesauruses--I already know too many words, who needs more--but I was
always having to look up the metrical stuff (what's the stress pattern
in a spondee again?), and
having this done automatically would have been excellent.