What is Scratch Addons?
Scratch Addons is an extension with a mission to collect, archive, and put into use userstyles and userscripts, developed by several members of the Scratch community.
Features
Various addons to empower your Scratch experience
Easy-to-use interface with various controls for each addons
Free, open source, and maintained by various people from the Scratch community
Install
Not yet, but you may load it locally.