Latest version: 0.73 - released on January 18th 2012 - changelog
pisg is an IRC channel statics generator written in Perl, it creates statistics from different logfile formats. It was originally written because IRCStats wasn't open source. So here's an open source/GPL'ed version to anyone interested. It's a funny thing for your IRC channel, and it's highly customizeable.
You can see some example pages in the examples section.
Supported logfile formats: formats documentation
Can't make things work? You can try the mailing list.