ScanErrLog :

• ScanErrLog is both a command line tool, a CGI script, and a Python module which processes the Apache web server 's error log files and generates statistical reports about the different errors encountered when serving web pages.It can produce reports in plain text, XML, HTML or PDF formats.
• ScanErrLog is used by web hosting providers worldwide to help their clients focus on the bugs they may have on their web sites. This gives an added value to their services, making their hosting solutions less error-prone, and improves the web experience of both their clients and all the web surfers who visit the sites they host.
• ScanErrLog is part of the official Debian GNU/Linux distribution.