Minecraft Java 1.21 Mods
Browse 9 free mods for Minecraft Java 1.21 — popular picks include Desire, Mob Tweaks, CreativeUtilities.
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Desire
A mod that focuses on building and simple gameplay tweaks to expand the classic experience to the max!!
Mob Tweaks
In this data pack you'll find tons of tweaks, buffs/nerfs and improved consistency in worldbuilding when it comes to mobs. Axolotls have become much better, Illusioners are now in the game and there are even a couple of useful new items.

CreativeUtilities
Collection of a lot of tiny features that help with building
Map Tools
Essential utilities for creating maps or building. Create smooth animations, realistic message printing, resource pack management, block display tools, danger command checker, position saver and much more
Base Origin Bugs
Quality of life tweaks to the origins of the base Origins mod by Apace! (Does not fix legitimate bugs with the mod)
HitRangeActivity
A mod featuring visual enhancements and combat utilities (particles, PotFix, and sounds). A mod based on BetterHitReg, which has been modified for legitimate use. Base version 1.21.11

Slashbridge
serverside utility mod aiming to add in minecraft commands that I think the base game lacks, bridging datapack and mod function.
Tiny DataLib
This project is a library with useful utilities such as a database system and more.
Tweaks Addon For MineColonies Mod (1.21.1, 1.20.1) – Improvements Colony Management
Tweaks Addon For MineColonies Mod is an addon for MineColonies that introduces various adjustments and improvements to enhance colony management, making gameplay more balanced and efficient. Features: Adjusts resource requirements and building mechanics. Enhances colony automation and management options. Ensures better integration with other mods. Custom ToolType. Custom Food Tag. Custom CraftingModule. Screenshots: Tweaks Addon […]