SpoutWorld
Do you have spout and want all of its cool features, but not all of your users have spout? This plugin lets you define where you need Spout required. You can define worlds as Spout-only, if they don't have Spout that world wont be available to them!
I think it goes without saying that you will need Spout installed for this plugin to work. But if you don't have Spout I don't see why you'd need this plugin!
Features:
Define worlds only for players who have Spout installed
Reject people who don't have Spout from your server
Customizable messages
Logging in to a Spout only world? Change their world!
Supports Permissions/SuperPerms/OP to bypass these restrictions
Known issues:
Players kicked to a main non-Spout world can take fall damage
Config