Dictionaries & Lexicons

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Online Lexicons and Dictionaries

Διογένης (or, Diogenes) Searching Software
This is a free tool for searching and browsing the databases of ancient texts, primarily in Latin and Greek, that are published by the Thesaurus Linguae Graecae and the Packard Humanities Institute. Please note that the aforementioned databases are not distributed with Diogenes and must be obtained separately.
G. M. Edwards' English-Greek Dictionary
The Ancient Library hosts this resource online. Enter the English word, press enter, and be directed to a digital image of Edwards' text.
Greek Lexical Parser
This searchable Greek/Hebrew parser is featured on Biola’s The Unbound Bible page. It allows users to search on the Greek word or root, and it interacts with Biola’s MultiLex Biblical Lexicon.
Liddell-Scott Greek-English Lexicon
Use Perseus' search engine to find entries on Greek words in Liddell-Scott.
MultiLex Biblical Lexicon
This searchable Greek/Hebrew lexicon is featured on Biola’s The Unbound Bible page.
S. C. Woodhouse's English-Greek Dictionary
The University of Chicago Library makes this classical Greek dictionary available online here. Enter the English word, press enter, and be directed to a digital image of Woodhouse's text.  
Souter's A Pocket Lexicon to the Greek New Testament
This is an early 20th century New Testament Greek lexicon written by Alexander Souter.
Strong’s Lexicon
This searchable Greek/Hebrew lexicon is featured on Biola’s The Unbound Bible page.
Teknia Greek Dictionary
This is an expanding Greek dictionary that allows students to select entries alphabetically (on the left of the page) and search for words based on their Strong’s number, GK number, or transliteration.
The Bible Tool
This is an online, searchable Bible database created by CrossWire Bible Society, SBL, and the American Bible Society. Users can search for Greek words in a number of resources (located on the left side of the page).
Thesaurus Linguae Graecae
The Online Liddell-Scott-Jones Greek-English Lexicon is available here. 
WiBiLex
This is the German Bible Society’s free online lexicon and encylopedia. The New Testament section is published by Stefan Alkier. Please note that they recommend viewing with Windows 7 for PC's and with Mozilla for Mac's.
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Books & Other Manuscripts

Abbott-Smith's Manual Greek Lexicon of the New Testament
This is available at Archive in a number of different formats.
Bauer/Danker's BDAG Greek-English Lexicon
This is the third edition. For reviews, see Rodney Decker's post here and Jerker Blomqvist review here.
Bullinger's Critical Lexicon and Concordance
This is the complete text of E.W. Bullinger's A Critical Lexicon and Concordance to the English and Greek New Testament. It is available in multiple formats.
Moulton/Milligan's Vocabulary of the Greek Testament
This work emphasizes the uses of Greek words in papyri and other non-literary works.
Thayer's Greek-English Lexicon
This is actually an enlargement of Grimm Wilke's Clavis Novi Testamenti. It is available for download in multiple formats.  
Veitch's Greek Verbs: Irregular and Defective
This is a Classical Greek dictionary for verbs available on Internet Archive in a number of formats.  
Yonge's An English-Greek Lexicon
This copy of C. D. Yonge's lexicon is available via Google Books for viewing and full download. It may also be viewed on Internet Archive here in multiple formats.