The Fabric Canon™
These mods are some of the key libraries and utilities for making mods. This list will be updated as more libmods are released.
Fabric API is almost mandatory for resource loading, and provides a lot of hooks to common mixin targets.
Silk adds, among other things, a library for FluidInstances for inventories to interact with.
NBT Crafting adds a system for interacting with NBT while making recipes, along with features like recipe remainders.
Towelette provides an interface to allow blocks to be filled with any fluid.
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Ladder API adds a tag to make blocks climbable.
Earl Gray adds a component system to store and access data on Entities.
Cotton adds libraries for config, logging, and material unification, as well as programmatic tag appending and global datapack loading.
LibBlockAttributes adds a Capability-like component system for item/fluid/etc. interaction between blocks.
Simple Multipart is a basic multipart system for Fabric.
Satin adds a manager for OpenGL shaders.
Multiblock API is a library for constructs that take up multiple blockspaces, like doors or beds.
Crochet adds networking utilities, as well as an API for storing data on a player.