The definitive source of information about fundamental physical constants, which is regularly revised to reflect the most recent experimental and theoretical information, is
but the definitive source of information about atomic masses is
It seems reasonable and proper, at least to my naive and scholarly mind, that, for commercially marketed software that pretends to include such data for the convenience of its users, and that is given at least annual releases of nominally improved, revised and extended versions, the content of these fundamental physical constants and atomic masses should be just as regularly revised. Why should a user expect less? The comment by Acer is absolutely pertinent: the inclusion of merely a list of values of all these data is insufficient in relation to the relations and correlations between values of fundamental physical constants that were built into Maple at one stage of its evolution, but that evolution has been stunted by neglect in succeeding releases -- arrested development. I repeat that, if Maplesoft would pretend to boast of "5565 changes and enhancements" that have been included in Maple 17, Maplesoft should, consistently, provide some further thousand changes and enhancements in the data in package Scientific Constants.