NBT Editor

If optionally installed on the server, this mod allows you OPed players to edit the NBT of items, blocks, and entities. If only installed on the client, you can still edit items in creative mode, even without OP.

List of Every Feature

https://github.com/mega12345mega/NBT-Editor/wiki/List-of-Every-Feature

Main Features

A gui for editing the NBT of items, blocks, and entities
A client chest; think of it like a multi-page enderchest across any server or singleplayer world
Editing container contents, including block items, blocks, entities, and your enderchest
A /get command to let you easily get items, create blocks, and spawn entities
A factory system to make common NBT edits easier
The ability to export and import items, blocks, and entities to commands, block items, spawn eggs, and .nbt files

Commands

/nbt [new <item> | export <format> | import | config]: Edit, export, or import the NBT of something, or open the config
/chest [<page> | <name>]: Open the client chest
/open [echest]: Open the container you're holding, looking at, or your enderchest, with no item restrictions
/get <item | block | entity | potion | soup | skull | hdb | preset | lostitem | help | credits> [<args>]: Get an item, place a block, spawn an entity, or get information
/factory <attributes | blockstates | book | display | enchantments | max | maxstacksize | randomuuid | signature | signboard | unbindskull | unbreakable> [<args>]: Utilities for enchantments, attributes, etc.

/get Command

/get item <item> [<count>]: Get an item (like /give @s)
/get block [<pos>] <block>: Get a block item or set a block (like /setblock)
/get entity <entity> [<pos>] [<nbt>]: Get a spawn egg or summon an entity (like /summon)
/get potion (normal | splash | lingering) <effects>: Get a potion with specific effects
/get soup <effect> [<duration>]: Get a suspicious stew with the specific effect
/get skull <username>: Get the player head for a player
/get hdb [<args>]: Access the Minecraft Heads database via a port of the plugin HeadDB by UnlimitedNinjas
/get preset <item>: Get a built-in item
/get lostitem [history]: Get an accidentally deleted item
/get help [nbteditor | clientchest | open | get | factories | textformat]: Get help, including for specific features
/get credits: Get the credits

Factories

/factory attributes: Edit attribute modifiers (for items) and attribute bases (for entities)
/factory blockstates: Edit block states
/factory book [new | make_writable]: Edit books (including in lecterns)
/factory display [name | lore | hideflags] [<args>]: Edit names, lore, and hideflags
/factory enchantments: Edit enchantments
/factory max [cursed] [all] [<level>]: Max an item's enchantments
/factory maxstacksize (default | <size>): Set an item's max stack size (1.20.5+ only)
/factory randomuuid [add | remove]: Add a random UUID to an item
/factory signature (add | remove | edit <new signature>): Add a signature to items
/factory signboard [new <type>]: Edit signs
/factory unbindskull: Remove a skull's link to the original owner
/factory unbreakable: Toggle an item's unbreakable tag

Shortcuts

Space: Edit an item's NBT
Shift + Space: Open the factory list for an item
Ctrl + Space: Open a container item
Extra tabs in the bottom left (configurable) of the inventory screen to access your client chest and enderchest
Group shortcuts (using /name instead of /factory display name) and aliases (using /f instead of /factory) are configurable in /nbt config