Spawner GUI

Spawner GUI is a mod which adds a GUI for Monster Spawners. To open up the GUI, right-click on the Spawner. From there, you can choose which mob to spawn. You cannot spawn mobs from mods. Slimes require being in their chunks, and 0-40 depth for them to spawn, and animals require grass, monsters don't spawn in broad daylight, so they need darkness, and Endermen require 3 blocks of height, and Enderdragons require the End, and darkness. You also cannot spawn Primed TNT, but apart from that, this mod nearly completely replaces using MCEdit for spawners.