Various Languages:

The Unbound Bible. Searchable and downloadable versions of the Bible in many languages. Includes 10 English versions, Hebrew, Greek (including the Septuagint), Latin, and Gothic versions, and 42 translations into modern languages including Albanian, Arabic, Bulgarian, Romanian, Russian, and Ukrainian.

Church Slavonic:

Slavyanskaya Bibliya. The traditional Church Slavonic version of the Bible.

English:

Aramaic Bible. A modern English translation of the ancient Aramaic version of the Scriptures. A number of New Testament books are available online.

The Blue Letter Bible. The King James Version with hyperlinks to the Hebrew (OT) and Greek (NT) texts, Strong's Concordance, and various Protestant commentaries.

ScripTours Online Douay-Rheims Bible. Includes the deuterocanonical books. Does not specify that it is the Challoner revision, but I think it is.

Douay-Rheims Bible - IntraText. As revised by Bishop Challoner; includes the deuterocanonical books.

The King James Version. From the Humanities Text Initiative, University of Michigan. Includes the deuterocanonical books.

The Revised Standard Version. From the Electronic Text Center, University of Virginia. Includes the deuterocanonical books.

The Revised Standard Version. From the Humanities Text Initiative, University of Michigan. Includes the deuterocanonical books.

The Rheims New Testament. From the Humanities Text Initiative, University of Michigan.

French:

ARTFL Project Bibles: Louis Segond Bible. Search or browse Louis Segond's French version of the Bible (1910). Does not include the deuterocanonical books.

German:

Martin Luther Translation. From the Humanities Text Initiative, University of Michigan. Does not include the deuterocanonical books.

Latin:

ARTFL Project Bibles: Jerome's Latin Vulgate. Search or browse St. Jerome's translation of the Bible (c. 405). Does not include the deuterocanonical books.

Vulgata Daniel et Esther. The complete Vulgate texts of the books of Daniel and Esther.

Scottish Gaelic:

An Soisgeul air réir Naomh Marc . The Gospel of St. Mark in Scottish Gaelic.

Spanish:

The Hypertext Spanish Bible. Unknown version. Does not include the deuterocanonical books.