Jewish Encyclopedia: Judah 
Overview of the fourth son of Jacob from the traditional Jewish perspective, including rabbinic commentary.
http://www.jewishencyclopedia.com/view.jsp?artid=592&letter=JTsaddikim: Yehudah
Presenting the Chassidic position on the Jewish forefather, including the folk belief that he slew Esau.
http://judaicaplus.com/tzadikim/yehudah.htm
Catholic Encyclopedia: Juda
Commentary on the son of Jacob from the traditional Catholic perspective.
http://www.newadvent.org/cathen/08536a.htm
Judah
Profile of the son of Jacob from a joint Lutheran and Catholic bible study project.
http://www.aboutbibleprophecy.com/p125.htm
Yehuda and Tamar
Rabbinic exegesis of Judah's relationship with his daughter-in-law.
http://members.tripod.com/~ohave/chumash/tamar.htm
Yaakov and Yehuda
Rabbinic discussion of Judah as effective leader of Jacob's clan.
http://www.vbm-torah.org/parsha.59/10miketz.htm
Yehudah's Plea to Yosef
A contemporary Jewish analysis of Judah's heroic defense of his youngest brother Benjamin.
http://www.myjewishlearning.com/texts/Weekly_Torah_Commentary/vayigash_kolel5760.htm
Parashat Toldot
Rabbinic argument for Judah and Joseph's final honesty with each other as tikkun (redemption) of their father's life of deception.
http://www.hir.org/torah/rabbi/5759/toldot59.htm
Jewish Virtual Library: Judah
Brief profile of the son of Jacob, with links to pertinent Torah passages.
http://www.jewishvirtuallibrary.org/jsource/biography/judah.html
