Anyone can track Zope changes with a read-only checkout of the sources - here are instructions for hooking it up.
There are several top-level modules in the repository - chief among them is the Zope sources - we’ll use them for our example. You can browse them all at http://svn.zope.org/
Read-only access is via Subversion svnserve access. Here’s how you can do your initial checkout.
For a Zope 2 trunk checkout:
svn co svn://svn.zope.org/repos/main/Zope/trunk Zope
For a Zope 2.11 checkout:
svn co svn://svn.zope.org/repos/main/Zope/branches/2.11 Zope
For a Zope 2.10 checkout:
svn co svn://svn.zope.org/repos/main/Zope/branches/2.10 Zope
etc.
For a Zope 3 trunk checkout:
svn co svn://svn.zope.org/repos/main/Zope3/trunk Zope3
For a Zope 3.4 checkout:
svn co svn://svn.zope.org/repos/main/Zope3/branches/3.4 Zope3
A read-only SVN mirror http://svn.zope.de that can be accessed through HTTP is provided by the Deutschsprachige Zope User Group (DZUG). Using the SVN mirror over HTTP is convinient if you are behind a firewall. Note that some Zope modules reference to other parts of the repository through svn:externals using the svn:// protocol. You will not be able to check out such modules correctly - in fact you may encounter timeouts..
You can also access the official SVN repository through HTTP read-only through http://svn.zope.org/repos/main/ .