Q&A: Papers of the Framers/Founders of the United States of America

Where can I find the papers of the Founders/Framers of the United States Constitution?

A good place to start is the Stanford Library's US History Collections Page for Colonial/Revolutionary History. here is the link to the section on Founders' Documents. There are links to digital papers, as well as call numbers for items which are not digital.

As far as digital collections go, there are 2 good database sources:
Thomas (from the library of Congress)
and The Avalon Project (from Yale University Law School). The Avalon Project Main Page has a search function. you can start by linking to pre-18th Century documents, and then search for Framers, and you will find many documents discussing the intent of the Framers even in the 18th century!