Jalli is a little java-based converter for chatlogs. At the moment it supports Pidgin, Empathy and mcabber. But there will follow many - platform-independant - others, I believe.
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phpLogFacility is a log class for PHP (like log4j for java or the dead log4php projects here), which enables you to use an easy to use logging mechanism inside your console or web script without the need of ugly debug screen output.
GILoT is an interpreting and formatting log tail:er. As each log entry is matched and formatted against customizeable rules, only relevant data is parsed.
GILoT features, atm, two separate user interfaces, a console UI and an ncurses/charva TUI.