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 (website)
"The Federalist" was co-founded by Ben Domenech and Sean Davis; senior editors include David Harsanyi and Mollie Hemingway. Domenech wrote that "The Federalist" was inspired by the mission and worldview of the original "Time" magazine's editor, Henry Luce, which he described as, "[leaning] to the political right, with a small-c conservatism equipped with a populist respect for the middle class reader outside of New York and Washington, and an abiding love for America at a time when snark and cynicism were not considered substitutes for smart analysis."