A new, open source, extensible, platform-agnostic tool
...Plugins allow you to add new features and resources. You could also download the desktop version of Vorlon. It is a standalone executable working on Windows and MacOS. By default Vorlon.JS application logs with debug level and files are stored in the installation folder.
Java script lightweight logger utility that helps log event messages of different severities debug/info/warn/error.
The logs gets inserted into collapsable div (can be toggled to collapse or expand) on the right top corner of the web page.