BDAG

A Greek-English Lexicon of the New Testament and Other Early Christian Literature by Walter Bauer and Frederick William Danker, (Third Edition; based on previous English editions by W.F. Arndt, F.W. Gingrich, and F.W. Danker; University of Chicago Press, 1957, 1979, 2000). ISBN 0226039331. The modern standard NT Greek lexicon.

BDB

A Hebrew and English Lexicon of the Old Testament, Francis Brown, S.R. Driver, and Charles A. Briggs (Clarendon Press, 1907). ISBN: 1565632060

DOTP

Dictionary of the Old Testament: Pentateuch, T. Desmond Alexander and David W. Baker (eds.) (InterVarsity Press, 2003). ISBN 0830817816. 

ISBE

The International Standard Bible Encyclopedia, Geoffrey W. Bromiley (general editor), (Eerdmans, 1979-1988; fully revised from the 1915 edition). ISBN: 0802837859. Excellent 4-volume scholarly, evangelical Bible dictionary.

Keil and Delitzsch

Commentary on the Old Testament, Carl Friedrich Keil and Franz Delitzsch (Eerdmans, reprinted 1976). Vol 1 (Penteteuch) was written by Carl Friedrich Keil (Johann Friedrich Karl Keil, 1807-1888), published in German in 1861 and translated by James Martin from German. Current ISBN 0913573884

NIDNTT

New International Dictionary of New Testament Theology, Colin Brown (editor; Zondervan, 1975-1978; translated with additions and revisons from Theologisches Begriffslexikon zum Neuen Testament, Coenen, Beyreuther, and Bitenhard, editors), ISBN 0310332389. 

TDNT

Theological Dictionary of the New Testament, Gerhard Kittel and Gerhard Friedrich (editors), Geoffrey W. Bromiley (translator and editor), (Eerdmans, 1964-1976; translated from Theologisches Wörterbuch zum Neuen Testament, ten volume edition). CD-ROM, ISBN 1577990994. Standard for many years, mixture of conservative and liberal treatments of NT Greek words.

TDOT

Theological Dictionary of the Old Testament, G. Johannes Botterweck and Helmer Ringgren (eds.), John T. Willis (trans.), (Eerdmans, 1975-).

TWOT

Theological Wordbook of the Old Testament, R. Laird Harris, Gleason L. Archer, Jr., and Bruce K. Waltke, editors), (2 volumes, Moody Press, 1980. ISBN: 0802486312). An electronic version is available for iExalt WordSearch.