If you've seen other hopper filtering plugins and thought: "Why are they all premium?" or "Why is it always outdated?", then this plugin is just what you've been searching for.

Filtering Hoppers is a free and open source alternative to the premium or outdated plugins you can find on this very website. Easy to use and straight-forward, all you need to do is drag-and-drop, shift + right-click on a hopper, put some items in the filter and you're good to go! All items will get checked by the filter, and if they don't match any item in the filter, they'll be kicked out! (Actually, they won't get in the hopper in the first place).