This site is of much broader interest than its name would imply: sacred-texts.com; in particular, for our purposes, the Classics section at
http://www.sacred-texts.com/cla/index.htm
There a number of facing-page bilinguals and also the complete Iliad and Odyssey in Greek. I downloaded these and I’m converting them to PDF book by book and printing it out. That way I can mark them up with scansion, interlinear translations and whatnot with a clear conscience.
On a totally different subject, if you love Lovecraft, pretty much his whole oeuvre is available under “Necronomicon.”
Apologies, apologies! I now find three earlier postings mentioning this site, by Sanskrit, edonnelly, and Kalailan. Guess I should look these things up before spouting off!