CleanCut

Fight enemies back through grass and other similar obstructions!

Point at a mob standing in tall grass, in flowers, behind a torch — anything without real collision — and CleanCut hits the mob instead of swinging at the plant. The same applies to right-clicking: you can shear the sheep standing in the wheat. It leaves alone the things you didn't mean to hit: your tamed pets, anything on your team, and whatever you're currently riding.

Client-side only. It does nothing on a server and doesn't need to be installed on one.