Castoreum is a small, lightweight modpack intended to preserve the feel of Vanilla Minecraft while being able to add small improvements. If you find something in a new world and say, "Is this from a mod?" then you've found the purpose of this pack.

The bulk of the pack is comprised of performance mods, small improvements, and optional features like shaders support and controller support. A small handful of mods on the list (namely Create & Alex's Mobs) are included because of the rich content they add to the base game. (I just couldn't resist)

Performance

Clumps
Rubidium
AI Improvements

Lazy DataFixerUpper
FerriteCore
Fast Leaf Decay
Not Enough Crashes
Feature NBT Deadlock Be Gone

Cosmetics

Oculus
Magnesium/Rubidium Dynamic Lights
Magnesium/Rubidium Extras
Distant Horizons - Optional due to performance issues.
- Sound Physics Remastered

UI Improvements

Mod Name Tooltip
Just Enough Items
Shutup Experimental Settings!
Controllable
Controlling
Mouse Tweaks

Structures

YUNG's Better Strongholds, Desert Temples, & Ocean Monuments
Repurposed Structures

Big mods

Alex's Mobs
Immersive Portals
Create
Quark

Other

Comforts
Trample Stopper
Carry On
Simple Voice Chat