WorldSpawns is a simple, lightweight plugin for setting spawnpoints on a per-world basis, as well as some complimentary features such as setting up a hub teleport, and teleporting players when they join.
Features
Set a separate spawn for every world
Set up a server-wide hub teleport (optionally)
Configure whether players should be teleported when they respawn, join or are joining for the first time
Configurable teleport delays and cooldowns
Multi-language support (see here for a list of supported languages)