A very, very simple plugin that does one task well. Which is that it will teleport any player from the void back to that world's spawn.

Supports EssentialsSpawn
EssentialsSpawn has its own storage system for spawn, but no worries VoidEscape has soft depend on essentials, using essential's spawn point if you are using it.

VoidEscape does not rely on player movement events which causes massive amounts of lag, and it only depends on the damage you get from the void, avoiding that and instantly teleporting you back to spawn.