No, I don't know any web resources; my poets' manual and rhyming dictionary is dead tree (and exceeding battered) But, unless you're intending to write classical forms, do you require intensive information about rules and limitations? Most poets I've met (and almost all of them are amateur - if it's difficult to live off book sales, which it is, how much harder to sell enough poetry to sutvive) started by writing things, and only moved on to analysing and perfecting, and studying (rather than reading and absorbing) traditional styles. How many pedants are going to ask for a sestina or a sapphic? (yes, I know one too, but)
Which is not to say there mustn't be lots of sites explaining the difference between anapestic heptameter and trochaic tetrameter, and conventional rhyming schemes, and very enjoyable it can be to try and fit an idea into a rigid, conventional format, but poetry is about emoition, communication of things that cannot be transmitted by conventional symbolic language; form,as ever, while important, follows function.