No tools seem to be working anymore. All tools give a 503:
Service Temporarily Unavailable
The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.
If I look in the access log I see that one of my tools last served a request at [30/Nov/2013:23:42:24 +0000]
Version: unspecified
Severity: major
URL: http://tools.wmflabs.org/