Archimedes Project Database
Online reference of all the major Classical dictionaries, including the LSJ.
Greek at the Language Gulper
A linguistic guide to Greek.
Index of Ancient Greek Lexica
Website with the ability to search ancient Greek headwords in thirteen lexica (both old and modern).
Open Greek and Latin
A project at the University of Leipzig which digitizes Greek and Latin Texts.
The Perseus Project
Will even parse words for you.
Thesaurus Linguae Graecae
Here you can browse and search Greek literature en masse; subscription-only.
Woodhouse: English to Greek Dictionary
An easy-to-use online dictionary, helpful for the composition of Greek.
FONTS & TECHNOLOGY
A Greek polytonic keyboard.
JOURNALS & ASSOCIATIONS