Religious
— Brown-Driver-Briggs Hebrew and English Lexicon
— Greek New Testament
— An Intermediate Greek-English Lexicon (by Henry George Liddell and Robert Scott)
— Liddell-Scott-Jones Greek-English Lexicon (different from above)
— New Testament Greek
— New Testament Greek Lexicon (available in King James and New American Standard versions, good source for word searches tied to Strong’s numbers)
— Old Testament Hebrew Lexicon (available in King James and New American Standard versions, good source for word searches tied to Strong’s numbers)

Secular
— Ancient Greek Language: A Critical Survey of Websites

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