I found this tool via Karl Arao’s TiddlyWiki under the Performance Database Tools. This free tool written by Marcus Mönnig called Mumbai has many nifty features focusing on data visualization including session profiling, alert & trace file viewing, 10046 tracing/viewing within the tool, etc. It also integrates with snapper and orasrp.
Here are some introductory webcasts of this tool.
Please check it out.