[tex-live] TL source code

[Karl Berry]

    http://tug.org/texlive/devsrc/Build/source.development/
    The stuff which goes to texmf trees:
    http://tug.org/texlive/devsrc/Master/texmf-*

You can also get it via
  rsync tug.org::tldevsrc -a --exclude=Images
if you're so inclined.  It's ~2gb.

Someday it'll be accessible in other ways and I'll write a web page
about it :).