Log Viewer - mithra62/ee_debug_toolbar GitHub Wiki
The Log Viewer extension for the EE Debug Toolbar (EEDT) displays the last 1000 lines of the ExpressionEngine latest log files.
The data provided from the ExpressionEngine logs is questionable in usefulness to put it mildly when logging anything other than errors.
Developers
If you're looking to add a custom, Ajax driven, panel to EEDT take a gander at the Log Viewer extension for examples of how it's done.