As you can see there is a clickable tab on the left of the page with a number of reference tools and dictionaries. It contains:
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Magic search — Site search (Google)
— Onelook.com (English monolingual metasearch searching over 1000 English dictionaries)
— ProZ.com English<>Greek search (many other language pairs available too)
— Mymemory corpus (English-Greek)
— Teleterm (English/French to Greek telecommunications dictionary by ELETO)
— Inforterm (English/French to Greek computers dictionary by ELETO)
— Greek grammar (Neurolingo grammar query, check the declensions of a word)
— English-Greek Wordrefence (queries the English-Greek dictionary by Wordreference)
— Greek (Triantafyllidis/Kriaras/Georgakas) [queries two Greek monolingual and one Greek-English dictionary containing only letter "a" entries]
— Microsoft glossaries (by default searches English-Greek, many other languages available)
— Greeklish converter (converts Greeklish to Greek and vice versa)
— Iate multilingual search (by default searches English-Greek)
You can also access all these dictionaries from this page:
Greek Computer Dictionary, Greek Medical Dictionary, Greek Technical