This client mod allows you to easily manage your inventory, in both single player and multiplayer. It works out of the box, and will make you gain a massive amount of time!
It automatically replaces your tools as they break, and item stacks once emptied
It sorts your inventory and your chests in a single click/keystroke
It provides lots of powerful shortcuts to move items around
It allows you to customize entirely the way your inventory is sorted, thanks to clever configuration files