Zachary Ware upgraded's  buildbot from 0.8 to 0.9:

buildbot 0.9 is the first release of buildbot that
can run on Python 3.  The buildbot master is running on Python

That master is connected to multiple workers/slaves, most of which are
0.8 running on Python 2:

This is a highly visible deployment of Twisted running Python 3,
and aligns with's direction to move the world to Python 3. :)