Direct online access to a number of dictionary resources, including the Liddell-Scott-Jones Greek-English Lexicon and the Lewis and Short Latin Dictionary.
A readable and searchable online collection of approximately 350 authors, including almost all Latin texts up to 200 CE (and a small sample of later authors).
Tools for searching the Perseus collection, looking up English-to-Latin or -Greek terms and dictionary entries, studying individual words, generating vocabulary lists, and more.