Neoforge Mods for Minecraft 1.21
Browse 179 free Neoforge mods for Minecraft 1.21 — popular picks include CobbleBoss, Smelting Sand in a Blast Furnace [Fabric/Forge/NeoForge], Petrolpark's Library.
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CobbleBoss
A mod that allows you to infinitely add and customize your own exclusive Bosses in the Cobblemon world.
Smelting Sand in a Blast Furnace [Fabric/Forge/NeoForge]
As the name says

Petrolpark's Library
A library of shared features and utilities for my mods
Jobs+
Adds 10 jobs to Minecraft. You can now add your own jobs!
Gunsmith Lib
Extensions and helper for tinkering with TaCZ.
Voltaic API
API for Electrodynamics, Nuclear Science and others of the Ampz mods
Smelt All Stone Blocks in Blast Furnaces [Fabric/Forge/NeoForge]
Blast all types of stone including Netherrack or Quartz, fully configurable
Blasting Raw Metal Blocks [Fabric/Forge/NeoForge]
Blast whole raw metal blocks, fully configurable
Woot Revived
A multiblock mod to harvest mob drops.
WunderLib: New Dawn
An unofficially maintained continuation of WunderLib for Fabric and NeoForge, providing automated configuration screens, grid-based UI layouts, simplified networking, and other utilities used by BetterX mods
Multiblocked2
Multiblocked2 is the more powerful visual custom machine/multiblock mod after mbd.
EZ Actions
Radial menu that works with any mod & empty keybinds, multi-command execution, API calls, and much more
Better Crafting [Fabric/Forge/NeoForge]
This mod changes and adds few recipes
VapourWare
Base mod that is the foundation for 1.20+ mods by VapourDrive. Contains shared code for fuel powered machines, and a wrench.
Recursive AE2 Pattern Provider
Automatically generate dependency patterns for complex AE2 recipes
ZeroCore
A mod intended for other mod authors, it contains a revised multiblock API that support multiple client mods without performance penalities, a new new GUI system, a base BlockEntity implementation that simplifiy data syncronization and much more.
Voice Chat Recording
A mod that allows recording player voices using Simple Voice Chat, and exposes an API to get and play them.
Create: Deployer API
A create library for addon-developers to simplify logistics

TNT Timer
Adds a timer above tnt which displays the time until it explodes.
Create: Diamond & Factory
This Mod make Diamond from Factory
KubeJS Diesel Generators
Create: Diesel Generators integration for KubeJS
[Discontinued] ChassisCore
Core for creating exoskeleton armor
Integrated REST
Expose Integrated Dynamics networks as a REST API
Porting Dead Libs
A library mod for all of Porting Dead Mods' Mods
[SBW]Drone Detector
A lightweight Forge 1.20.1 mod that turns a handheld (or inventory) detector into a minimal HUD listing nearby UAVs with names and approximate distance, beeping only for the closest, with server-controlled range and custom sound.
SDM Recipe Machine Stages
The ultimate progression tool for tech-based modpacks. Lock machine recipes behind stages with seamless KubeJS and CraftTweaker integration.
Immersive Convergence
API for Immersive Engineering addons
Travelers Lib
My library for adding animals and other helpful features
Craft 6 Stairs Instead of 4 [Fabric/Forge/NeoForge]
makes it so that you get the same amount of stairs from crafting as you get from the stonecutter
KubeJS Oritech
KubeJS integration for Oritech.
Mekanism: Empowered Core
A library mod focused on empowering Mekanism.
SlashBlade: HF Blade
FE Energy SlashBlade, as a playable lib
BankSystem
BankSystem is a Minecraft mod that brings money in to the game. Used as a dependency for other mods
Piglin Conservatory v3.0
Adds a news structure to the Nether, The Piglin Conservatory, along with a new Obsidian Apple, Dragon Fruit, Toxic Mushrooms, Hoglins' Fossils, Corrupted Emerald and a New Music Discs!
Gravity Control
Lets you change player gravity direction
Create: Cobblemon Factories
All Pokeball and cooking pot recipes createified!