Dialogue with Trypho, a Jew, Chapters 1-9 
The Prologue of Justin's Dialogue with Trypho, translated by Paul Vincent Spade. In pdf. 99K.
http://pvspade.com/Logic/docs/justin.pdfThe Second Apology of Justin 
Table of contents allows jumping to a particular chapter. No notes.
http://www.ccel.org/ccel/schaff/anf01.viii.iii.html
Dialogue with Trypho, a Jew 
From the Ante-Nicene Fathers, vol. 1, American edition. In HTML, at Christian Classics Ethereal Library.
http://www.ccel.org/ccel/schaff/anf01.viii.iv.html
On the Sole Government of God 
G. Reith translation. In HTML, with notes, at Christian Classics Ethereal Library. From the Ante-Nicene Fathers, vol. 1, American edition. Some doubt that Justin is the author of this work.
http://ccel.org/ccel/schaff/anf01.viii.vii.html
Fragments of the Lost Work on the Resurrection 
M. Dods translation. Some debate whether this is indeed Justin's work. In HTML, with notes, at Christian Classics Ethereal Library. From the Ante-Nicene Fathers, vol. 1, American edition.
http://ccel.org/ccel/schaff/anf01.viii.viii.html
Other Fragments from the Lost Writings 
A. Roberts translation. What we can piece together from what other early authors say about Justin Martyr.
http://ccel.org/ccel/schaff/anf01.viii.ix.html
Hortatory Address to the Greeks 
M. Dods translation. There is some debate as to whether this is really by Justin. From the Ante-Nicene Fathers, vol. 1, American edition. In HTML, with notes, at Christian Classics Ethereal Library.
http://www.ccel.org/ccel/schaff/anf01.viii.vi.html
Discourse to the Greeks 
M. Dods translation. Some doubt whether this is by Justin. From the Ante-Nicene Fathers, vol. 1. At Christian Classics Ethereal Library.
http://www.ccel.org/ccel/schaff/anf01.viii.v.html
First Apology 
From the Ante-Nicene Fathers, vol. 1, American edition. In HTML, with notes, at Christian Classics Ethereal Library.
http://www.ccel.org/ccel/schaff/anf01.viii.ii.html