Exactly as the title says, it allows resource packs provided by servers to be overridden and moved in the resource pack menu. That's it.
You can get the Fabric version here!
Updates creepers, Causing them to summon Creepies when exploding, but removing their ability to break blocks.
A new form of entertainment
Apply any look you want to your items, and make your own Vanity Packs to share with the world.
Introduces sitting, crawling, and various 'gamefeel' enhancements!