Trillog displays your chat history. It is able to merge several sessions into one.

Trillian Log Explorer displays your chat history. It can remove and export log file entries and provides powerful search features.

Trillian Log Viewer displays your chat history.

IMmerge merges chat logs between several Trillian installations and converts ICQ and MSN logfiles to Trillian logfiles

Trillian Logfile Converter is a perl script that converts your logfiles to HTML.