Thesaurus Linguae Graecae (TLG) [create a personal account or log into it, upper right] || Video Tutorials for TLG
Database in Greek of all known ancient Greek writings up to 600 A.D. Allows the user to search for Greek words or phrases as they were used in a particular writer or work or time period, resulting in excerpts, a few lines long, of all passages that embody the particular word(s) that have been searched.
Note that when you first log into TLG, you will be asked to set up a free personal account. Every time you go back to TLG, you will need to log in again, using the login screen at the top right of the initial TLG page.
There is no translation included with TLG.
Loeb Classical Library - Electronic texts of Greek and Latin authors, with English translations on opposing pages. This is the entire collection
Many Loeb volumes are public domain and thus available in open access full text. Links to available volumes - Listed in series number order. (In most cases, the "Archive" link is more reliable than the "Google" link.) Wikipedia Index to Loeb volumes by author.
For all of the Oxyrhynchus Papyri as photo images of the manuscripts see http://www.papyrology.ox.ac.uk/POxy/papyri/the_papyri.html and use the links under heading The Papyri.
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