Cf. Resources on Speaking Places History
Perseus by Tufts University is limited to Ancient Greece, but is becoming exhaustive, it offers the original and translations and is supported by dictionaries and other tools. Useful, if you know exactly what you are looking for. The responsibles should consider the option of displaying complete texts and not only small portions in an infinite series of pages.
Myriobiblos E-text Library of the Church of Greece. A wealth of sources and studies in many languages. Don't forget to visit this place.
Early Christian Writings. New Testament, Apocrypha, Gnostics, Church Fathers. The site is well organised, and contains also links to studies of the first centuries.
Christian Classics Ethereal Library at Wheaton College publishes the Ante- and Post-Nicene Fathers. Limited to the (first) Christian centuries, not very selective and, sometimes, even difficult to use, but a work of love and discipline, always getting better.
Cf. Resources on Speaking Places History Suggest a resource!
Those who see the absolute and eternal and immutable may be said to know, and not to have opinion only. - Plato
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Reference address : https://www.ellopos.net/elpenor/greek-texts/greek-resources-texts.asp?pg=4