Mods

Amendments
by MehVahdJukaarMany changes to vanilla blocks

Chunky
by pop4959Pre-generates chunks, quickly and efficiently

EnhancedVisuals
by creativemdFeel the pain!

Yeetus Experimentus
by SunekaerDisable's the Experimental Settings popup, which appears when you create or load world.

Sodium Dynamic Lights
by TxniMultiloader port of LambDynLights that adds Sodium options integration

Sounds
by IMB11It's what it says on the tin. A complete upgrade to Minecraft's SFX with over 170 new sound effects for UIs, items, blocks and more.
Fabrishot
by ramidzkhTake insanely large screenshots because why not

Polytone
by MehVahdJukaarCustomize Map Color, Block Colors, Colormaps and Block Sounds, Biome Colors, dynamic colored lights, Dye Colors. Supports Optifine format. For Resource Packs

(Sodium) Chloride
by SrRapero720Gives Sodium additional Performance and Quality features for a tasteful experience
ReplayMod
by Johni0702A Minecraft Mod to record, relive and share your experience.

L_Ender's Cataclysm
by mcl_enderCataclysm is a mod that adds difficult dungeons, challenging boss-fights and powerful items.

SuperMartijn642's Core Lib
by SuperMartijn642SuperMartijn642's Core Lib adds lots of basic implementations that allow for similar code between different Minecraft versions!

Cristel Lib
by CristelknightA Library mod for easy structure config and runtime datapacks.

Default Options
by BlayTheNinthShip default options or keybinds without having to overwrite an existing options.txt.

YUNG's Better Strongholds
by YUNGNICKYOUNGA complete redesign of Minecraft's strongholds!

Wavey Capes
by tr7zwThe cape shouldn't be a static slab

ServerCore
by Wesley1808A mod that aims to optimize the minecraft server.

Cut Through
by FuzsCleanly swing through transparent blocks like tall grass to hit mobs without breaking said block.

Particle Core
by fzzyhmstrsParticle optimizations: Culling, rendering optimizations, configurable particle-type-specific spawn reduction, and potion particle disabling. Compatible with Sodium, improves performance over Sodium alone.

Towns and Towers
by Biban_AuriuSpice up your world with new villages, pillager outposts, and even new ships!

Prism
by GrendA library all about color! Provides lots of color-related functionality for dependent mods.

BetterGrassify
by UltimatChampGamers can finally touch grass!? OptiFine's Fancy and Fast better grass implemented on Fabric and NeoForge!
Paginated Advancements & Custom Frames
by DaFuqsBetter advancements screen

YUNG's Better Witch Huts
by YUNGNICKYOUNGAdds overhauled witch huts to swamps!