Biblical Bibliography of Lausanne - database of articles, books and collected works. Can search by keyword, subject, author, biblical reference, theme and Greek and Hebrew terms.
Biblical Studies.org compiled by Rob Bradshaw - index to a wide variety of journal articles, links to freely available full-text for over 20,000 articles
BILDI - extensive index to Biblical Studies material - indexes 90 journals completely, selectively indexes over 500 other journals and includes articles in collected works and Festschriften
Oriental Institute of the University of Chicago Integrated Database - index to books, articles, book sections as well as photos, museum and archival resources. Good source to locate research resources on Ancient Near Eastern religions (Egyptian, Zoarastianism etc.), Biblical Studies and early Christianity, and early history of Islam and Judaism.
Focused:
AnaBiDeut (Analytische Bibliographie zum Deuteronomium) - analytical bibliography of works on Deuteronomy
Dead Sea Scrolls Bibliography - secondary literature from 1995 to the present. Maintained by the Orion Center at the Hebrew University; updated weekly.
e-Clavis: North American Society for the Study of Christian Apocryphal Literature - searchable database providing information on the texts and listing of primary of secondary sources
IGNTP Bibliography - works on the history of the International Greek New Testament Project
Interpretation of Scripture (biblicalstudies.org)- can key word search or browse to subject ( History, Apocalyptic, Holy Spirit, Idioms, Language, Old Testament, Narrative, The Law, Poetry, Wisdom, Old Testament in the New Testament, New Testament, Parables, NT Letters, Prophecy and Typology)
Rhetorical Theory - " diverse resources that can be consulted for rhetorical critical analysis and criticism of New Testament (NT) and other early Christian writings."
Sacra Pagina - guide to glosses and commentaries from the Latin Bible to the Medieval period (Nicholas of Lyra, Hugo of St. Cher etc), includes links to fulltext
