Spawner is the one Minecraft plugin from this set that I have publicly released. It focuses on collecting spawners with silk-touch tools, changing mob types, merging and restoring spawners, and integrating with economy and hologram systems for richer server administration.
It has documentation, public release pages, NBT-aware handling, redstone-aware behaviour, dynamic entity detection, multiple optional integration providers, modern Java/runtime expectations, and a broader support footprint than the more experimental internal plugins. That makes it a useful example of taking a gameplay/admin idea through the extra work required for public consumption.
Public release work is different from private server code: version compatibility, docs, integration fallbacks, and operator expectations all become part of the product. Spawner shows that side of my plugin work clearly.