Wopper is a NeoForge mod for Minecraft 1.21.1 (NeoForge 21.1) that adds exactly one block: the wooden hopper. Originally a Forge 1.10.2 mod (here)[https://www.curseforge.com/minecraft/mc-mods/wopper], it has been fully ported to the modern NeoForge platform.
The wopper works much like vanilla's iron hopper, but as a wooden alternative it slots in earlier and cheaper in your automation chain. Every few ticks it moves a single item from the inventory directly above it into the inventory it faces. When there's no container overhead, it instead vacuums up dropped item entities floating above it and pushes them forward into the destination inventory — handy for collecting drops from farms, mob grinders, or item sorters.
