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Here's a list of the stuff we have running on the SpamAssassin zone, spamassassin.zones.apache.org.
AutoMC: run from cron, spiders the SpamAssassin bugzilla, finds bugs marked with a specific keyword, performs MassChecks on those. currently disabled.
Buildbot: continuous integration daemon, running at http://buildbot.spamassassin.org:8010/ . It uses Python and the Twisted framework, which is installed in /local. It runs "make test" (and variants) on each checkin.
PreflightBuildBot: another continuous integration daemon, using the same infrastructure, but aimed at testing our rulesets.
RuleQaApp: web application aimed at QA'ing and developing rules.
Corpus-rsync: rsync.spamassassin.org, an rsync server with several authenticated accounts for upload of nightly MassChecks results and those for the periodic rescoring run.
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Httpd: provides public read-only access to the nightly MassChecks' log files; also serves pre-packaged tarballs for the nightly MassChecks; access to the RuleQaApp.
We also have a selection of locally-installed binaries in /local. Mostly, this is custom perl builds – /local/perl561 , /local/perl586 , and the Twisted framework for Python. Also GD, for the RuleQaApp's graphs.