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Constitution of the U.S.A., Analysis & Interpretation:at Govinfo.gov, at Findlaw and as CRS Annotated Constitution at Cornell LII. This work, prepared by the Congressional Research Service, provides extensive annotations to the Constitution, with references to U.S. Supreme Court cases. The Findlaw version merges the 1996, 1998, and 2000 supplements with the 1992 edition text, and gives links from the case citations to the full opinions, but omits some prefatory and appended material found in the full original version at FDSys, such as texts of proposed but unratified amendments, lists of federal and state acts held unconstitutional, and a list of overruled Supreme Court decisions.
The Founders' Constitution (at Univ. of Chicago Press) A major collection of the writings of the Founders, arranged under the relevant clauses of the Constitution.