I've tried several debug bar add ons to show filters and hooks. What I like about this one is that it's easy to dynamically filter out the items you don't care to see. Clicking on any filter or action then shows more information about how it was used, which is very useful.
The only down side is that it generates a lot of data so it slows down the page load quite a bit when it's active. I only enable the plugin when I need it so that hasn't been a problem for me.
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