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De Principiis
http://www.newadvent.org/fathers/0412.htm
F. Crombie translation, from the Ante-Nicene Fathers, vol. 4, American edition. Author's preface and each of four books in their own HTML files. Book IV is incomplete.
Origen
http://www.reu.org/public/origen/orig.htm
F. Crombie translation, from the Ante-Nicene Fathers, vol. 4, American edition. Includes author's preface. In eight plain text files.
Origen de Principiis
http://www.ccel.org/fathers2/ANF-04/anf04-44.htm
F. Crombie translation, from the Ante-Nicene Fathers, vol. 4, American edition. Author's preface and each of four books in their own HTML files, with notes and links to previous, next, table of contents. Book IV is incomplete.