Original plugin made by Cyprias at https://dev.bukkit.org/projects/chunkspawnerlimiter.
Limits entities in a chunk. Highly configurable. Stats by bStats.
Default config.yml here.
properties
debug-messages: Show debug messages in console.
check-chunk-load: Check chunk upon load.
check-chunk-unload: Check chunk upon unload.
watch-creature-spawns: Check chunk upon mob spawn.
check-surrounding-chunks: Check surrounding chunks.
active-inspections: Periodically recheck loaded chunks.
inspection-frequency: How often to inspect a chunk.
notify-players: Notify players within the chunk when it's culled.
ignore-metadata: Ignore entities with metadata.
entities
List of mobs to remove and their max limits.
excluded-worlds: Worlds to exclude mob limits in.
messages: modify removed entities message.
/cslreload or /csl reload - Reloads the config.
Permission: csl.reload
/cslinfo or /csl info - Shows the current spawn reasons & entity limits.
Permission: csl.info
/cslsettings or /csl settings - Shows the current settings & messages.
Permission: csl.settings