4Literature = 4Literature.net, an anonymously-run site for the publication of books of all genres and periods; very difficult to navigate around, but contains a number of texts not available elsewhere
Aoidoi = Aoidoi.org, run from Madison, Wisconsin, USA, devoted to Greek poetry
Perseus = The Perseus Project, run from Tufts University, USA, with mirror sites in Berlin (Germany) and Chicago (USA); contains bilingual versions of most of its texts, often with commentaries and cross-references; original-language versions have a dictionary look-up hypertext facility; links from LATO to Perseus are to the Tufts site. As the Tufts site is often very slow, you can try the Berlin or Chicago site simply by chopping the server name, "www.perseus.tufts.edu", out of the URL and replacing it with "perseus.uchicago.edu" (easier to remember) or "perseus.mpiwg-berlin.mpg.de" (less easy)
Philoctetes = ΦΙΛΟΚΤΗΤΗΣ, created by M. Daniel Lancereau and M. Samuel Béreau