Most bible study tools are based on key words, not key ideas and related events.   For example, if you want to study leadership, you must look up elder, pastor, those who have charge of you, deacon, apostle, etc.  making it hard to find every related verse.  Now you can just click on a tag or category and find all related verses side-by-side.  This is a work in progress.  Feel free to email me with any additional verses you find.