Compiled from the list based on what is given here
Targum of Canticles
A newer translation of the 1st chapter is found in C.D. Ginsburg commentary on Song of Songs (1857) on pages 29-33
A translation may also be found in the series Translations from Hebrew and Aramaic with the volume by H. Gollancz (1908) on pages 15-90
Second Targum on Esther / Targum Sheni of Esther
This is found in the English translation of P.S. Cassel’s commentary An Explanatory Commentary on Esther tr. A. Bernstein (1888) found on pages 263-344.
Targum of Qoheleth
Found in Coheleth, Commonly called the Book of Ecclesiastes in 1861, by C.D. Gill on pages 502-519
Targum Onkelos and Jonathan on the Pentateuch
J.W. Etheridge The Targum of Onkelos and Jonathan Ben Uzziel on the Pentateuch with the Fragments of the Jerusalem Targum (2 Volumes 1862-1865)
Targum of Isaiah
Found in The Chaldee Paraphrase of the Prophet Isaiah by C.W.H. Pauli in 1871
Older Translations that I’m unable to find
I have been unable to locate these works, which should be public domain by now. If anyone can point me to them, it would be appreciated.
Targum on Song of Songs
Targum of Canticles is found in the work Exposition of the Book of Solomon’s Song by J. Gill (2nd Edition 1751) Unfortunately I cannot find an early enough edition on the internet, Gill’s later editions of this commentary took it out.
Later edition can be Found Here, it still references the Targums a lot.
Targums of Ruth and Jonah
From O.T. Crane (1886) in The Targums on the Books of Ruth and Jonah: Literally translated from the Chaldee.
Ruth may also be found in Studia orientalia volume 2 (1928) by A Saarisalo on pages 88-104
Targum on Lamentations
In 1893 by A.W. Greenup in The Targum on the Book of Lamentations
The following are online translations that I have found. http://targum.info/ has been particularly helpful. If there are any other online English translations, please leave a comment
a new translation by Edward M. Cook, 2001
Targumim of the Megillot
Song of Songs
A Translation by Jay C. Treat
A translation by Samson H. Levey
And a Translation by C.M.M. Brady
Translation by C.M.M. Brady
Targum Onqelos (According to Yemenite Manuscripts)
Here’s a quick list of online resources for the Targums in their original language, I’m sure there’s more, but didn’t bother to look