An easy-to-use UI plugin manager. Pulls plugins from multiple repos, installs and updates plugins seamlessly, gives precedence to locally installed plugins (based on file names). Hope this one works for you.
If you want to test-drive it before merging, you can download the below as a plugin here: https://github.com/patriceac/Easy-Diffusion-Plugins/blob/main/plugin-manager.plugin.js
The URLs at the top of plugins.js might need to be updated.