Probably the most advanced mob customizing data pack out there - tweak individual mobs, equipment, behavior and more easily via menus.
Just the title Image
Example of Locator Bar Spawn Egg Icons
Menu Example 1
Menu Example 2
Menu Example 3
Menu Example 4
Menu Example 5
Menu Example 6
Menu Example 7
Menu Example 8
Menu Example 9
Menu Example 10
Menu Example 11
Menu Example 12
Menu Example 13
Menu Example 14
Menu Example 15