Mobeditor

A project that allows you to change the stats of items, entities, and armor without leaving the game.
(If you want to increase stats beyond what's possible in Minecraft, use AttributeFix.)

YDGs project

Added the ability to add flight to armor sets as in creative, attack effects and passive effects.
Also in older versions it was possible to change any entity’s health, damage, or make it a boss. You can also change the damage to objects, effects when you hold them in your inventory, second hand or main hand. You can change the characteristics of the armor. You can remove and add loot with quantity and chances. If something is not applied immediately, exit the world and come back.
To use, enter /mobeditor and you will be given hints to enter further.
If you want to support me, just star my repositories on Github(❁´◡`❁)
https://github.com/uragrom/mobeditor