The Slime Produce App is a fun app that lets you watch slimes spawn in hutch and drop items based on their color. By default, these items are the same as the vanilla drop for slimes, but you can specify which items to drop and even what color they should be.

When a slime ball is first-generation, it will come out of an egg rather than being bred.

You can also customize which items to drop, and even what color they should be, by setting up a custom drop table in the configuration file. Each table will have two fields: colorRange and itemDrops.

This mod is very easy to use and install, but first, you must have SMAPI.