Bone Math v0.1.0 2 w Saves a couple tedious minutes adjusting pole angles, doesn't clutter the UI, and you can alt+click to do it on all selected bones at once. What's not to love?
Math Vis (Console) v0.2.2 2 w PR #147773 broke this but all you need to do to fix is change all instances of console_python to _console_python. Still a very useful add-on!
Saves a couple tedious minutes adjusting pole angles, doesn't clutter the UI, and you can alt+click to do it on all selected bones at once. What's not to love?