Original meaning
Originalists of all stripes cite "The Federalist Papers". It is fairly tenuous to suggest that this represents a good source for the original "intent": after all, Alexander Hamilton, who wrote the majority of those essays, was absent for the greater part of the Philadelphia Convention, and John Jay did not attend it at all. However, James Madison, the principal framer of the Constitution also wrote a substantial amount of "The Federalist Papers". Also, to suggest Hamilton and Jay's absence from the convention implies their ignorance as to the Constitution's original meaning is demeaning to those two men and inaccurate. The collected anti-Federalist papers, of course, will be no use at all to a person searching for the original "intent" of the framers. However, as evidence of how a reasonable person at the time would have understood the words of the Constitution, "The Federalist Papers" and the anti-Federalist essays are evidence of direct relevance.
The Federalist Papers
A 1792 French edition ended the collective anonymity of Publius, announcing that the work had been written by "MM Hamilton, Maddisson E Gay", citizens of the State of New York. In 1802, George Hopkins published an American edition that similarly named the authors. Hopkins wished as well that "the name of the writer should be prefixed to each number," but at this point Hamilton insisted that this was not to be, and the division of the essays among the three authors remained a secret.
The first publication to divide the papers in such a way was an 1810 edition that used a list left by Hamilton to associate the authors with their numbers; this edition appeared as two volumes of the compiled "Works of Hamilton". In 1818, Jacob Gideon published a new edition with a new listing of authors, based on a list provided by Madison. The difference between Hamilton's list and Madison's formed the basis for a dispute over the authorship of a dozen of the essays.