Slackow

Turns on togglesprint when you join a world/server or die, so you don't have to press or remember to press a key to turn it on.

Removes the comically long "Debug Charts" line in the f3 menu

Extracts server resource packs when they are sent to the client and are downloaded into a folder within the game directory (usually .minecraft).

Allows you to press Command + Drop key to drop a stack of items on macOS

Adds various snowballs that cause damage and destruction on impact.