Hi! I don’t have any data to answer your question. It also seems to me that the Racket and Chicken communities are very active, and have good tools for that, such as PLaneT and Eggs.
Yet, Guile has been one of the most widely installed Scheme implementations, which I think is mostly because it started as “the official GNU extension language”. This has two implications: a few widely used applications depend on it (LilyPond, GnuCash, TeXmacs, cgen, etc.), and socially, it targets free software hackers in general and not just Schemers or functional programmers (I’m not arguing on whether it’s successful at that, just that the approach is different from that of other Schemes.) FWIW, Debian’s popularity contest shows these ranks (see <http://popcon.debian.org/by_inst>): 868 guile-1.8-libs 15462 racket-common 24184 libchicken5 Thanks, Ludo’.
