The complete Greek-English Lexicon by Henry George Liddell and Robert Scott (more than 116 000 entries).
Search using Greek characters or Beta code.
Search for English words in the text of the definitions is also possible (full text search).
A few classical texts, including Homers Iliad and Odyssey and the 4 Gospels, in bilingual version.
Document reader which allows to analyze inflected forms in the body of the text, and to search the corresponding entry in the database.