http://dev.bukkit.org/server-mods/monsterbox/
its a plugin that allows us to mine spawners and receive them they also remain as they were meaning if you mine a skeleton spawner when you place it will become a skeleton spawner but that not all you can use eggs to make it a certain spawner lets say you get a zombie spawner but you wish you could make it a cow spawner well we can get an egg click on the spawner and it will turn into a cow spawner you can also set prices for them meaning if you use a skeleton egg on a zombie spawner it will subtract however much you made it have to be paid for sounds cool right if you are wondering it is updated to the dev builds
its a plugin that allows us to mine spawners and receive them they also remain as they were meaning if you mine a skeleton spawner when you place it will become a skeleton spawner but that not all you can use eggs to make it a certain spawner lets say you get a zombie spawner but you wish you could make it a cow spawner well we can get an egg click on the spawner and it will turn into a cow spawner you can also set prices for them meaning if you use a skeleton egg on a zombie spawner it will subtract however much you made it have to be paid for sounds cool right if you are wondering it is updated to the dev builds