The Logfile Navigator (https://lnav.org https://lnav.org) is a terminal-based tool for digging through logs. It's visualization capabilities are pretty limited

The Logfile Navigator (https://lnav.org https://lnav.org) is a terminal-based tool for digging through logs. It's visualization capabilities are pretty limited at the moment (it can draw stacked bar charts for the results of SQLite queries). It would be interesting to know what other types of visualization you would be interested in.