I think that most of the items do state what they are made for (like my wings). Often times if it says "must own..." that's a pretty big clue it was a purchased item Otherwise they usually say things like "textures for PhilC's Classic Wrap" (yup another of mine lol) either way the majority of the stuff in the free section does tell us what it is for.

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I do not feel obliged to believe that the same God who has endowed us with sense, reason, and intellect has intended us to forgo their use.
-Galileo