Dictionaries

B.D.B - (Brown Driver Briggs) The Best Known and Most Popular Lexicon of the Hebrew Bible for English Speakers (somewhat dated)

K.B - (Koehler Baumgartner) The Most Reliable Hebrew Bible Dictionary, Available for free only in German.

Halladay - The Abridged Koehler Baumgartner Dictionary in English.

Grammars

Gesenius - The Best Known Grammar of Biblical Hebrew for English Speakers (dated).

Jouon - Muraoka - The Most Reliable Grammar of Biblical Hebrew for English Speakers

Bible Portals and Link Libraries

Links to Free Bible Resources

Mechon Mamre - The Hebrew Bible with or without Masoretic Cantellation, has a Concordance Feature (Jewish Religious Site).

Biblos - A portal with many features, including a myriad of translations, concordances, dictionaries, atlases and commentaries (Christian Religious Site)

Theopedia - An Academic Encyclopedia of Bible Related Topics (Christian Religious Site)

Bible Study Tools - A Christian Portal for Bible Study with many useful Links to Translations, Concordances, Dictionaries and other Features

Link Library - A List of Valuable Links to mostly Free Bible Resources including Dictionaries, Grammars and Versions