SpawnEntity is a plugin that allows players to spawn any entity by name or id at the players cursor location. You can spawn any entity, but my favorite in the ender crystal. The list of spawnable entities and their ids are below.

Commands

New /entity <EnumName> (quantity) - Spawns quantity(default 1) entity(s) of specified name at cursor location.
Old /entity <id/name> (quantity) - Spawns quantity(default 1) entity(s) of specified id/name at cursor location.

Permissions

spawnentity.use - Permission to use the /entity command.
spawnentity.multiple - Permission to spawn more than one entity at once.

Entity List

EXPERIENCE_ORB
PAINTING
ARROW
SNOWBALL
FIREBALL
SMALL_FIREBALL
ENDER_SIGNAL
THROWN_EXP_BOTTLE
ITEM_FRAME
WITHER_SKULL
PRIMED_TNT
FALLING_BLOCK
FIREWORK
BOAT
MINECART
MINECART_CHEST
MINECART_FURNACE
MINECART_TNT
MINECART_HOPPER
MINECART_MOB_SPAWNER
CREEPER
SKELETON
SPIDER
GIANT
ZOMBIE
SLIME
GHAST
PIG_ZOMBIE
ENDERMAN
CAVE_SPIDER
SILVERFISH
BLAZE
MAGMA_CUBE
ENDER_DRAGON
WITHER
BAT
WITCH
PIG
SHEEP
COW
CHICKEN
SQUID
WOLF
MUSHROOM_COW
SNOWMAN
OCELOT
IRON_GOLEM
HORSE
VILLAGER
ENDER_CRYSTAL
SPLASH_POTION
EGG
LIGHTNING

New Enum List
Old (Deprecated) List