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(guile-tut.info)How to characterize Guile

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How to characterize Guile
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  I have already mentioned that Guile has become a kitchen sink package;
here you can see how Guile freely takes new commands and constructs from
the portable Scheme library _slib_, the _Tk_ widget set, a posix
library (useful for UNIX systems programming), the regular expression
library _rx_, and many more ...

  So Guile has many more primitive procedures available to it than those
specified in Note: Revised(4) Report on the Algorithmic Language
Scheme.  On top of that, Guile will interpret
almost all standard Scheme programs.  The only incompatible difference
between the basic Guile language and R4RS Scheme is that Guile is case
sensitive, whereas R4RS is case insensitive.  We hope that few people
have written Scheme programs that depend on case insensitivity.

  Here is a possible view of the _sum of the parts_ in Guile:
     guile   =       standard Scheme (R4RS)
             PLUS    extensions to R4RS offered by SCM
             PLUS    some extra primitives offered by Guile (catch/throw)
             PLUS    portable Scheme library (SLIB)
             PLUS    embeddable Scheme interpreter library (libguile)
             PLUS    Tk toolkit
             PLUS    threads
             PLUS    Posix library
             PLUS    Regular expression library (rx)
             PLUS    Tcl library