Writing poem
Near rhymes: http://www.b-rhymes.com/rhyme/word/heart
Rhymer by WriteExpress: http://www.writeexpress.com/online.html
Rhyme Generator: http://www.poemofquotes.com/tools/rhyme-generator.php
Heretical Rhyme Generator: http://www.pangloss.com/seidel/Poem/
RapMetrics: rapmetrics.com