Mapmaker's Gadgets

Which, as you would imagine, lets you edit villager trades.

Lets you edit a spawner's stats, and change which mobs it can spawn with spawn eggs.

You can place up to 9 spawn eggs in the top left, which are mobs the spawner will randomly choose between:

You can then us the spawner editor item to place down more of the last spawner edited (since vanilla doesn't let you ctrl + middle click the spawner to get a spawner with nbt data... ):

Creates a spawn egg from a mob, useful with the spawner editor above.

Makes potions with any custom effects and color.

Should work with modded potions too! Sadly the vanilla saturation effect is still borked in potions (but works in the potion arrows strangely...)

Edits many things about items, like lore, enchantments, attributes, color (for leather armor and such), and other stats... this one does a lot.

Say you want to make a nice pair of boots like these:

Well it's actually not too hard with this item editor. Just grab a pair of leather boots, and edit the name and lore:

Then perhaps make them Unbreakable and give them a color:

(The hide flags is to hide enchantments, attributes and such, and the last two are for adventure mode block breaking/placing)

Then maybe give them an enchantment or two:

And finally customize the item attributes:

Edits many things about entities, like name, equipment, attributes, and other stats. This one also does a lot.

Say to want to edit several stats about an entity:

If your entity is a living mob, you can also edit more things like:

Also a convenient way to edit the mob's equipped armor and held items, as well as their drop chances (from 0-1, with 2 meaning it will drop the exact item without trying to randomize the durability):

And finally a way to edit the mob's base stats, like max heath and speed:

Lets you start a fight between two mobs (Like the boss spawners from chocolate quest did).

Like making two shulkers fight each other... hehe

Make entities ride other entities... much fun to be had with this one =)

Copies item, mob, and tile entity NBT tags so you can use them in commands and loot tables.

No more manually copying output from /blockdata and /entitydata commands... =P

Turns a mob into a Tiny Spawner, which will turn back into that mob when a survival/adventure player gets near.

Mostly in case you have a structure mod that supports blocks but not entities