List of Plugin Implementations - mezz/JustEnoughItems GitHub Wiki

It can be helpful to get started by using a working example.
Thankfully there are many implementations, here are some to take a look at:

• Vanilla Minecraft (written as a plugin in JEI)
• Blood Magic
• Botania
• Draconic Evolution
• EnderIO
• Forestry (Apiculture)
• Forestry (Machines)
• Immersive Engineering
• Iron Backpacks
• Mantle
• Refined Storage
• RFTools
• Caged Mobs
• Mekanism