Latin and Greek dictionaries supported by Tufts University. Offers ability to search for exact words, words containing, words starting, and words ending with a search string.
Excellent program for Latin and Greek word searches. Although there is a web version, the desktop program is better. This link provides access to both Diogenes Desktop (for download) and DiogenesWeb (for online searching).
Android app. An open-source tool for students who are interested in learning about ancient Greek. It includes a full copy of Liddell and Scott's Intermediate Greek-English Lexicon that is searchable. It also contains the text of Jeffrey A. Rydberg-Cox's Overview of Greek Syntax.
The Complete Latin Course is a comprehensive introduction to Latin for students and armchair enthusiasts alike. This modern, user-friendly text offers a series of fascinating glimpses into the world of ancient Rome, and sets you up to read Virgil, Cicero, Juvenal, Tacitus and many other authors in the original Latin.
Website for the study of Latin via Wheelock's Latin. The site combines audio lesson podcasts, web & mobile study tools, and games to provide a comprehensive study of the Latin language.