BibleArc is an online tool for graphically analyzing the flow of any section of Biblical text.
The original Hebrew or Greek text can be displayed, along with any of various translations (ESV, NAS, KJV). There are tools for marking the flow of thought within the text. Additionally, the site provides a 40-part online video tutorial for using the tool.
The Greek text includes mouse-over parsing and definition. There are options for entering comments and notes. To save outlines online, one can register for a $10 yearly fee.
I've only begun to explore this tool, so can't comment beyond saying that it looks ambitious and promising.
Any of you already familiar with it?