Optimum Modpack

Quick important update after 2.1.3 on:
Applied Energistics 2 (Mod got stable with this update)
Cyclops Core
Integrated Dynamics
Trash Cans

Also, You can update The Undergarden mod only before creating a world. If you created a world before updating, you will face a data pack issue which currently doesn't have a solution. If you accidentally updated Undergarden then you can downgrade it to 0.3.8 version to fix this issue