Nice

A modern shader pack loader for Minecraft intended to be compatible with existing OptiFine shader packs

Displays a map of the nearby world terrain, players, mobs, entities in the corner of your screen. Lets you create waypoints which help you find the locations you've marked.

A Minecraft mod that allows for efficient connected textures

A working voice chat in Minecraft!

A zoom mod with infinite customizability.

Adds dynamic lights to Minecraft as the most feature-complete and optimized dynamic lighting mod.

BetterF3 is a mod that replaces Minecraft's original debug HUD with a highly customizable, more human-readable HUD.

A gameplay-focused shader pack with a semi-realistic style

A client-side schematic mod with extra features for creative mode work

Allows for render distances greater than the server's view-distance

Gamma / Brightness / Night Vision mod, making it easy to see in the dark. Basically Fullbright for Fabric and NeoForge.

A Minecraft Map Editor... that runs in-game! With selections, schematics, copy and paste, brushes, and scripting. Use it in creative, or use it temporarily in survival.

Minimalist vanilla-like widget to display your armor items and their durability. Forked by uku.

Various client-side tweaks, such as hand restock, hotbar swap/cycle, flexible/fast block placement etc.

A Level of Detail rendering mod

A "mini F3" HUD mod, also with various overlays like light level, spawn chunks, slime chunks etc.

Effortless in-game skin customization and management—change, store, and customize your skins with SkinShuffle. Instant skin changes available on compatible servers.

Display player's PvP Tiers in their nametag! (MCTiers and SubTiers)

A client mod that adds many shortcuts to move items easier and craft faster in inventory screens