3) GITSTATS
The gitstats linked in the sponsoring pages are a great idea but
they are out-of-date (november 2012). Any chance to keep them
up-to-date automatically?
Also, I'd rather link to the Authors tab:
http://lilypond.org/~graham/gitstats-3months/AUTHORS.html
gitstats is just a python script. Who has access to the server may
just set up a cron job to create the stats every X days:
https://github.com/hoxu/gitstats/blob/master/doc/INSTALL
Actually, it can be even run within 'make doc'. I've just run and it
compiles the stats of 2015 in 40 seconds:
$ time gitstats -c processes=2 -c start_date=1/1/2015 lilypond-git
lilypond-gitstats-2015
[...]
real 0m40.352s
$ du -h lilypond-gitstats-2015
612K lilypond-gitstats-2015
I'll move the discussion to @bug-lilypond