+Be aware that @code{lilypond-extra} is the definitive source for some binary
+files - in particular PDF versions of papers concerning LilyPond. To add
+further PDFs of this sort, all that is necessary is to add the PDF to
+@code{lilypond-extra} and then add a reference to it in the documentation. The
+file will then be copied to the website when @code{make website} is run.
+
+However, pictures that are also used in the documentation build are mastered in
+the main git repository. If any of these is changed, it should be updated in
+git, and then the updates copied to @code{lilypond-extra}.
+
+@node Grand Unified Builder (GUB)
+@unnumberedsubsubsec Grand Unified Builder (GUB)
+
+Another item of interest might be the Grand Unified Builder, our
+cross-platform building tool. Since it is used by other projects as
+well, it is not stored in our gub repository. For more info, see
+@uref{http://lilypond.org/gub}.
+
+There are two locations for this repository: the version being used to
+build lilypond, which is at
+
+@example
+@uref{http://github.com/gperciva/gub}
+@end example
+
+and the original version by Jan Nieuwenhuizen, kept at
+
+@example
+@uref{http://github.com/janneke/gub}
+@end example
+
+
+@node lilypad
+@unnumberedsubsubsec lilypad
+
+Our binary releases on MacOS X and Windows contain a lightweight
+text editor. This code is here:
+
+@example
+https://github.com/gperciva/lilypad
+@end example
+
+
+@node yet more repositories
+@unnumberedsubsubsec yet more repositories