Perseus Project
Greek Texts with each word
linked to a lexicon.
Thesaurus Linguae Graecae
Online Greek texts - Pick a font
then search for Plato
Library of Ancient Texts Online
Greek texts with various
English and French Trans.

MIT Internet Classics Archive
English Text
Easier to read than Gutenburg

Alex Catalogue
Various Text sources

Last Days of Socrates
Euthyphro, Apology, Crito, Phaedo
Hyperlinks in text to glossary
and comments

Project Gutenburg
English Text

Digital Text Projects
Some Dialogues

Episteme Links
Various Text Sources